TROND Bluetooth Transmitter Receiver 5.0, 2-in-1 Wireless 3.5mm Audio Adapter, AptX Low Latency, Smart Codec Indicator, 2 Devices Simultaneously, for TV, Home Sound System

I bought the Trond Bluetooth receiver/ transmitter to use as a receiver with some wired in ear headphones to pair with my metal detector which is Bluetooth low latency capable. I've only used this this device a few times so far and only in receiver mode but so far I am very happy with it!. Firstly- initial pairing of the device to my metal detector was straight forward without any issues whatsoever!. Secondly- once paired they continued to connect without a problem after having switched off the device and my metal detector and switching back on. Thirdly- when in use I haven't so far lost the connection, and Fourthly- I can confirm that this device is Low Latency as advertised because my metal detector has an indicator (a + sign) that pops up on the screen if it detects a low latency Bluetooth connection whereas if the device isn't low latency this + sign doesn't show up- when connecting this device to my detector I do get the + indicator!. Low latency is obviously important when metal detecting because you don't want much lag between running your metal detector coil over a target and when you hear the signal through the headphones otherwise it would be difficult to know where to dig your hole!. The battery life appears good so far and although there isn't an indicator to let you know the battery status I have done two consecutive metal detecting sessions each of which was between 3 and 4 hours without charging between trips and there was still power in the device. Because I don't want to risk running out of battery when out metal detecting I will err on the side of caution and charge the device before I've used it for the claimed 9 hour battery life- although from my experience so far I assume that the battery life claimed in the instructions of approx 9 hours is most likely correct but I haven't tested this as not used the device until power has been completely depleted. As for longevity/ durability of the device- I can't say at the moment as I have only used it in total 3 times so far and only charged it twice so far. I plan on using this device a lot more so may provide an update with how it continues to operate. If this device continues to work as it has so far then that would be great because at the moment I am very happy with how it works and can thoroughly recommend it!.

I have several pairs of high quality Bluetooth headphones which work great with my smartphone, but wouldn't play nicely with my Windows 10 PC. I previously tried a cheap USB Bluetooth adapter, but the sound quality was rubbish - lots of lag and crackling. This Trond Bluetooth DUO device works almost perfectly with my PC. It supports AptX Low Latency for the best sound quality. It's definitely much better than the cheap USB Bluetooth adapter I was using before. Pairing with my Bluetooth headset was easy. The hardest part is remembering what button presses are required! 3 seconds on the multi-function button (MFB) turns the device on or off. To enter pairing mode, it's a quick double tap on the MFB. There's a red and blue LED - different combinations of flashing lights mean different things... you have to refer to the user manual to understand the flashes, which is a little annoying. Would it have cost much more to have several different LEDs with little icons to indicate their purpose? Even basic home Internet routers have several LEDs with icons. This Trond device stopped working once during the first month of use. I had to switch it to receive mode and then back to transmit, then re-pair with my headphones, then it started working again. One unfortunate problem is the noise generated when you have the power plugged in - you can hear low-level static interference while music plays. Not good. I would have happily paid more for a device that didn't suffer with such basic electrical interference. For the price this device is fantastic. I just wish it was a little easier to use, with separate buttons for different functions and more LEDs so I didn't have to remember what all the morse code flashes mean! And the static noise while charging is a real shame.

The Trond BT-Duo S arrived promptly and well packaged. It's very compact, smart, and came with clear, well written and detailed instructions. I use it mainly to stream music (classical, pop, rock) from my HiFi (Cyrus Lyric) to a set of AKG N60 wireless headphones which I bought at the same time as the Trond device. Ease of operation, range and performance are all very good. There 's no noticeable drop in sound quality between using the Trond with my HiFi and using the wireless headphones directly with my iPAD. I also for interest's sake used the Trond to connect my Panasonic TV with the wireless headphones and didn't notice any significant lag between image and sound. I've only used the Trond in transmission mode, not as a receiver. The only (minor) issue is that the Trond website referenced in the instructions doesn't seem to exist, though they also provide an email address.

...sort of!!! Maybe an audio efficiency artefact, but you can perceive the silence as it seems the sound is complete cut out, kinda like when you have low quality MP3s, at the low spots, then re-appears when the movie sound increases. Initially, I was a big fan of it, but having tried it with my bluetooth headphones and speakers, I'm certain of this behaviour... and I don't like it! When the audio level is sufficient though, it sounds great, hence the 3 stars. :-/

Only had for a day, and only used in receiver mode but so far very impressed...! I bought it to connect a pair of wired Bose QC25 up to my Panasonic TX-55FZ950 OLED which has a built in BT transmitter. Went for this one as its one of the few that states low latency in receiver mode as well as transmit. The device paired straight away with no problems. It also connects automatically to TV when I turn on the Trond I have set bluetooth audio level to 50% on TV which means I can just use the audio buttons on the Trond to control volume. Sound quality is decent enough It's smaller than I expected (which is good). see picture compare to £2 coin

I have bought both the Trond transceiver (BT-DUO S) and the Trond receiver (BT-RX S), both with aptx low latency. They work splendidly together. I have tested with several different phones. The day they arrived there was a very noisy party at my neighbour's. I put my old Bose noise cancelling headphone and watched tv as in paradise. Next night, as there were no parties nearby, I watched TV with my Galaxy Note AKG earphone, so I would not disturb anyone in my apartment. And it was as perfect as before. Really happy with both Tronds. The quality of the sound is fantastic, there is no hiss at all. I have then tried the transceiver with my Samsung Gear Circle bluetooth headset, instead of using the Trond receiver, and it also worked marvellously. The bass was better with the Trond receiver though. I definitely recommend both! Beware, if you want to use two headphones with the wonderful aptx low latency simultaneously, you should buy the TROND BT-DUO II instead, because the TROND BT-DUO S downgrades to SBC whenever you connect it to two phones at the same time. The SBC's latency is much bigger, therefore it is not recommended for movies. Otherwise, it is perfect.

Have two of these. One is sending from my receiver to the other one and here I use headphones with cable. Why you ask? Sony flagship Z9D lacks the basic ability to send audio over Bluetooth. Secondly, if it did I would doubt APTX ll would be provided which means that you will suffer heavily from lipsync. So one is acting as transmitter and the second as receiver. This works fine except one thing. What thing!? With this setup, depending on your type of earphone/headphones you might experience background noise. You will probably not have background noise if you only use one as transmitter and using a Bluetooth earphone directly connected to it (hopefully you have aptx ll). Why? Don't really know but you can get rid of this background noise if you find the right headphones. In fact my older Steel Series (gaming headset for PC) works perfectly without any noise issues. Monster pro turbine, vsonic, Samsung earphones etc all gave background noise. Problem solved with the Steel Series. Awesome! Now the sound quality is very good. People who says otherwise must have crappy earphones or a faulty unit. Please be careful when turning off the receiver as the unit makes a pip-sound (very very loud). Not sure if it will make this sound if battery runs out. It does have interference if I cover the unit in my hand but nothing while in my pocket!? Initially I bought their silver-unit which act only as a reciever but it got much much more background noise. Never tried my Steel Series with it so can't say for sure if it would have been gone or not. Summary. If your BT headphones have aptx ll you are probably safe to background noise and lipsync issues. I didn't hear anything with my non-aptx bose 35. If you use wired headphones and use this unit as receiver and tv (or whatever) as transmitter you are probably safe for background noise. The noise will be there if you use two of them. Then try all headphones you have to make it less. 5 stars if the volume buttons is one step adjustment instead of holding the button down AND if the pip during power it off is reduced /removed.

The product does what it promises however within seconds of the music or movie dialogue stops it starts bleeping. It's very ANNOYING!. Also the connection is a bit unstable giving jittery sound which will only stop after repairing which you need to do EVERY SINGLE TIME. I'm very disappointed as the unit looks good and it sounds good so much so that I would have used it with my non bluetooth headphones, however, most of the time it would have been in my bedroom but with that ANNOYING beeping it won't let me get any sleep so I'm returning it fast.

The Trond BlueTooth transmitter with codec AptX Low Latency works perfectly. It is small, Trond Bluetooth v4.1 Transmitter Empfänger/Wireless 3,5 mm Audio-Adapter, mit aptX geringer Latenz sowohl für TX & RX, Dual Stream und Volumen Controller easy to use, battery capacity is good and pairing easy. The synchronisation between screen (lips) and sound is perfect when using it to watch/listen to TV. Of course my Denon AH-GC20 headphone also has the AptX Low Latency codec, I bought the Trond BT v4.1 transmitter because my previous BT transmitter was just not suitable for watching TV. The sound was totally out of synchronisation with the screen.

Oramai siamo circondati di oggetti che utilizzano il bluetooth per fruire dei contenuti audio e video e sempre più spesso si rende necessario permettere a dispositivi non più nuovissimi, di comunicare con i dispositivi wireless. Proprio per questo motivo (rendere Bluetooth il mio vecchio TV e trasmettere l'audio dal mio smartphone al mio Hi-Fi) ho deciso di recensire l'adattatore Bluetooth TROND BT-DUO S, evoluzione del modello precedente, che funge sia da ricevitore che da trasmettitore CONFEZIONE e DESIGN L'adattatore TROND BT-DUO S si presenta con un packaging semplice, molto ben protetto e completo, contenente: - l'adattatore TROND BT-DUO S - Un cavo con ad entrambe le estremità un jack da 3,5mm maschio - Un cavo USB-MicroUSB per la ricarica - Un adattatore RCA-Jack da 2,5mm femmina - Le istruzioni in inglese e la garanzia L'adattatore è in una plastica leggermente gommata che ottimizza il grip e con una banda in alluminio con il logo Trond che la rende molto piacevole da vedere. Sul lato destro troviamo il tasto di accensione/spegnimento, e i tasti per il volume/avanzamento tracce (in base alla lunghezza della pressione sul tasto). La possibilità di regolare il volume e spostarsi tra le tracce è una cosa che ho apprezzato moltissimo. Sul lato sinistro troviamo solo lo switch per usare l'adattatore in modalità ricevitore/trasmettitore Sul lato basso invece troviamo l'ingresso Jack da 3,5mm e l'ingresso MicroUSB per la ricarica. L'adattatore ha una batteria integrata che permette una decina di ore di autonomia. UTILIZZO - Modalità Ricevitore L'utilizzo come ricevitore (ad esempio: trasmettere l'audio dallo smartphone all'impianto hi-fi di casa che non ha il bluetooth) è davvero semplicissimo! Occorrerà collegare l'adattatore al dispositivo che riceverà il segnale (ad esempio all'amplificatore dell'hi-fi) tramite il cavo jack o RCA, accendere l'adattatore, questo entrerà in modalità di pairing e poi accoppiare il dispositivo tramite il device che vogliamo usare per trasmettere (ad esempio lo smartphone). A quel punto potremo godere dell'audio in qualità CD, grazie al supporto del codec APTX-Low Latency (a patto che anche lo smartphone supporti tale codec). UTILIZZO - Modalità Trasmettitore In maniera simile a quanto fatto nella modalità ricevitore, occorrerà effettuare l'accoppiamento. Per procedere collegare l'adattatore al dispositivo da rendere wireless (ad esempio il mio vecchio TV), spostare il selettore su TX, poi prendere il device da accoppiare (nel mio caso le cuffie Bluetooth), accenderlo e metterlo in modalità pairing. A questo punto accendere l'adattatore TROND e tenere premuto il pulsante di accensione per 3 secondi. Quando i due dispositivi saranno accoppiati la luce led blu dell'adattatore smetterà di lampeggiare. Anche in questa occasione non ho avuto nessun problema con i miei dispositivi e tutto si è configurato in pochi secondi. IMPORTANTE: Il dispositivo funziona anche mentre in ricarica, ma occorre collegare il dispositivo alla fonte di carica prima di accenderlo. QUALITA' DEL SUONO Devo dire che la qualità è davvero ottima, ho testato l'adattatore in modalità ricevitore con il mio mini hi-fi Kenwood e con il mio impianto con amplificatore a valvole, tramite il mio Xperia Z3 (che supporta l'APT-X) e la differenza rispetto al CD è semplicemente sul volume (dipende dal telefono) ma il suono ha una ottima dinamica e spazialità, cosa che non avevo mai trovato con altri adattatori Bluetooth. Ovviamente non è un dispositivo per audiofili, ma soddisferà il 90% di chi cerca musica di qualità tramite Bluetooth. Rispetto al mio Tp-Link Bluetooth 4.0 senza APT-X, l'audio è davvero di qualità superiore. Ottima la resa anche in modalità trasmettitore con il mio TV Samsung. Inoltre il Codec Apt-x presente è l'evoluzione più recente ossia quella a Bassa Latenza, che permette di risolvere uno dei classici problemi del bluetooth: quello del ritardo audio. Con questo adattatore infatti non si avranno problemi di fuori sincrono tra video e audio. Ovviamente essendo la latenza molto bassa (40ms) ma non nulla, questo device non può essere utilizzato per scopi professionali (ad esempio da musicisti). CONCLUSIONI Al prezzo al quale è proposto, il TROND BT-DUO S è davvero un ottimo acquisto. Ha lo stesso prezzo di quelli della concorrenza ma offre di più, ovvero la cosa più importante: il miglior codec Bluetooth. PRO - APT-X Low Latency - Tasti volume e gestione tracce - Facilità di utilizzo - Batteria CONTRO - nessuno

Review of the following two items purchased together: Tx/Rx: TROND Bluetooth V4.1 Transmitter Receiver / Wireless 3.5mm Audio Adapter with aptX Low Latency & aptX for Both TX & RX, Dual Stream and Volume Controller Rx: TROND 3.5mm Bluetooth V4.2 Audio Receiver Adapter with AptX Low Latency & Volume Control, for Home Stereo, Wired Headphones & Speakers Both are 5 stars IMO. Here’s what I was looking for and what I found: Main objective: Use a BT receiver to allow me to use wired high quality headphones (Sennheiser HD650, HD598, HD555 mod to 595) with BT enabled devices (TV, computers, iPhone 7+, iPods and iPads) and secondary objective of using wired headphones with non-BT enabled legacy devices (iPod classic, older TVs) Why? Good quality BT enabled headphones are expensive and have a limited frequency range (Bose QC35 $349, and Sennheiser HD-1 Wireless $499, 28 ohm impedance, 16-22000 Hz) compared to higher quality headsets (Sennheiser HD650 300 ohm impedance, 10-41000Hz; HD598 50 ohm, 12-38,500 Hz, HD280 64 ohm, 8-25000 Hz). Even though BT has improved up to BT 4.2 and codecs for sound transmission have improved to decrease latency and transmit a broader range of frequencies, it is still cheaper to convert wired headset to BT capability at the inconvenience of managing a dangling cable. I don’t expect the BT transmission to have the same quality as a headphone wired directly to a receiver or iPhone/iPod/iPad Why did I purchase both? a. Reviews of many bluetooth (BT) receivers (Rx) used to drive headphones reported lag between video and audio. I wanted the receiver, but if there was going to be lag, then I’d pair the Rx/Tx with the Rx to see if that helped. I looked for low latency drivers. b. For non-BT devices (old iPod classic, non BT TV, I needed a BT Tx, so a combo Rx/Tx made sense. What features were I looking for? a. Volume control on the Rx. Why? because the wired headphones don’t have volume control unless I put a volume control between them and the Rx. Samsung Series 6 600D and Series 7 700D UHDTVs with BT don’t provide volume control using the TV remote; therefore the receiving end of the BT Rx has to control the volume. b. Most up to date BT 4.1 or 4.2 so that it maintains backwards compatibility with other BT units (not all BT are the same — i.e. my iPhone 7+ can pair to a Jaybird Freedom, but my iWatch series 2 won’t pair with the Jaybird Freedom). My intended uses: 1. Pair Bluetooth TV to Rx connected to headphone, if there is latency, then connect Rx/Tx to TV RCA outs and pair Rx/Tx to Rx connected to headphone 2. Pair iPads/iPhone/iPod blue tooth to Rx/Tx in Rx mode or Rx connected to headphone 3. Pair Rx/Tx to Rx connected to headphone DESIGN. Both have the same small form factor, plastic box except the Rx has an on off sliding switch rather than just a single button that has to be held 3 seconds to turn it on. Rx/Tx no sliding on off switch, just a button that has to be held down 3 seconds. EASE OF CONNECTION: Charged both fully. Tx/Rx set to Tx and turned on, Rx turned on 1st time and they paired within 5-10 seconds. Tx/Rx goes to solid blue; Rx goes to LED off blinking blue every 10 seconds instead of solid blue to indicate connection. No I can connect any nonBT device (TV, older iPods, iPod Classic) via male to male 1/8” plug to the Tx/Rx set to Tx mode and headphone connected to Rx and I have a functioning BT system. I just wrap the headphone cords up with velcro and put it on one side of the headband … looks geeky but I’m using it for function, not looks. To set either unit to pair, just double tap the “power button” and they immediately blink red blue red blue until paired. Once paired, Tx/Rx light goes to solid blue, Rx blinks blue every 10 seconds. Even if a connection is active, the double tap “power button” breaks the connection and sets the units to pair mode. Pairing is quick. Pairing to Samsung 600D, 700D UHDTV is easy. Go to Menu Settings > Audio > Select Speaker > Bluetooth. The Trond unit will show up no screen, select pair and it’s done in 5 seconds. Volume control is on the Trond unit; Samsung remote cannot control volume from TV. NO LATENCY on both TVs to Rx/Tx or Rx. Very nice. Don’t need to implement the Rx/Tx —> Rx method. This gives me a BT Rx for each TV now. Caveat, iWatch series 2 cannot pair to either Trond Rx/Tx set to Rx mode or Trond Rx. But iWatch series 2 cannot pair to Jaybird Freedom BT earphone. iPhone 7+ pairs to Tronds and Jaybird Freedom BT and work without problems. This seems to be more of a problem with the iWatch than the Trond units. DROP OFFS and DISTANCE: Connection good to HDTV BT 30 feet away unobstructed. No drops offs of signal or loss of connection with iPhone in pants pocket and received on opposite side of my head indoors. Haven’t tested outdoors where BT can’t bounce off walls. Intermittent breakup when BT Rx separated from BT Tx by a floor (i.e. receiver on 1st floor, Tx in basement, but of course it gets better when I’m standing 1 floor immediately above the Tx in the basement). If paired to iPhone 7+ and I turn on the car to which the 7+ is paired, the Trond connection shuts off and the car and 7+ become paired to give priority to car-phone handsfree connection. Trond doesn’t have a speaker and can’t be used for answering calls (which is not what I got this for). SOUND QUALITY: No lag from Samsung UHDTV Series 6 and Series 7 using the TVs BT. No audio-video lag between TV and Trond Rx, iPad and Trond Rx playing movies on Amazon Prime and Youtube. Sound quality depends upon type of headphone connected to Rx, but the Rx and Rx/Tx can both drive a 300 ohm impedance Sennheiser HD650 without problem. (Avantree Quick Clip reportedly has a hiss and can’t drive anything more than 32 ohm from what I’ve seen on reviews on Amazon). The sound quality (frequency spread) is not as wide as wiring the HD650 directly to my iPod classic, but it’s almost as good (i.e. like listening to an MP3 at 320 kbps instead of a lossless MP4/M4A at up to 1444 kbps sampling). I use MP4 lossless music files as I can hear the difference in quality between 1444 kbps sampling MP4/WAV and MP3 320 kbps max. I am very satisfied with the BT performance from iPhone 7+ to Trond Rx to HD650, and iPod Classic to Trond Rx/Tx to Trond Rx to HD650. Even though reviews say an HD650 is best used with an external amp, I have been more than satisfied with the performance with an un-ampped HD650 driven by an iPod classic or iPhone 7+ lightning to 1/8” plug given the type of recordings I use (which are much better than the 128 kbps stuff found off of iTunes music store … the stuff that many are satisfied using less refined headsets and earbuds). Works just fine with the other HD598, HD 555 mod to HD 595, so it should work just fine with anything lesser. Even the slightly truncated sound of the Tx/Rx to HD650 is still better than any of the other headsets. Wired is always better than BT, but BT is getting close. Other specs: HD280 8-25000 Hz, 64 ohm impedance HD555 12-38599 Hz HD598 12-38500 Hz, 50 ohm HD650 10-39500 Hz, 300 ohm HD1 16-22000 Hz, 28 ohm; this is Sennheiser’s $499 BT headset Bose QC35 $349, QC2, QC3 — I can’t find specs on these, but the Trond’s drive my QC3 just fine. Haven’t tested QC2 and of course the QC35 doesn’t need this. In general, Bose headphones tend to muddy the mids and are thus more bass heavy than balanced headphones. Sennheiser HD700 8-44000 Hz, 150 ohm, $419 Sennheiser HD800 19-44900 Hz, 300 ohm, $990 I’d rather spend my money on an HD700 than on the $499 HD1, so the Trond BT are a workable solution for me. If they can drive the HD650, I’d anticipate it should do just as well with an HD700. Things I haven’t tested: I haven’t tried the Rx/Tx bind to two Rx to drive two headphones, but this is what would be needed to drive 2 headsets from one TV. I haven’t tested how week the signal would get from an Rx connected to a 1/8” splitter to drive two headsets. FINAL THOUGHTS: 1. Trond Rx/Tx and Rx are both 5 star. 2. BT pairing is easy, quick and simple. 3. No lag between audio and video from Samsung UHDTV BT to either Trond unit. 4. Trond Rx able to drive 300 ohm Senheisser HD650 without hiss 5. Less cost than the Avantree Quick Clipper Pro and Priva III (which I considered prior to purchasing these). Reportedly the Clipper can’t drive anything >32ohm per specs. If you don’t need a BT Tx, then I’d just buy the $20 Trond BT Rx. If you want flexibility, then get the Trond BT Rx/Tx with volume control which are $37 as of 3/20/2017. Even though iPhone and iPod Classic can control the volume transmitted to the Rx, the Samsung TVs don’t; therefore, I wouldn't get the BT Rx/Tx without volume control or volume at the headset will be loud unless you put a volume control between the Rx and the headset plug. 3/24/2017 Update: I liked these so much, I bought another pair of Tx/Rx and Rx. Amazon had a lightning deal on the Tx/Rx for around $25. Great deal. To get them to initially pair, make sure no other BT devices are on. I couldn't get them to pair initially when my BT Samsung UHDTV was on because the TV seems to automatically pair to devices like this. Once I turned off the TV, I could get the Rx/Tx to pair to the Rx. After that, pairing was quick as long as the two were in near contact with each other though other BT devices were on. Update: 4/10/2017 When using these with a sensitive, low impedence in ear monitor -- Shure PTH500/530, there is background noise when played at low levels; the Shure can play really loud at a lower volume setting than >50ohm impedance headphones (i.e. No low level noise using Sennheiser HD280 (64 ohm), HD 555/598 (50 ohm), HD 700 (150 ohm), and HD 650 (300 ohm). Paired to Samsung Series 6/7 UHDTVs as well has headphone output on a Yamaha RX-3060 receiver running a connected BluRay, I find no lag between audio and visual, even after putting the movie through various digital signal processes on the Yamaha.

5 etoiles sans hesiter! Je ne sais pas comment sont les autres combinés emmetteur/recepteurs bluetooth, mais le Trond que j'ai acheté correspond exactement a mon besoin. Petit, leger, robuste, simple a utiliser, bonne autonomié, bonne puissance "output" en recepteur,et SAV au top! Le representant d'assistance ma ecrit avant meme que j'ai réceptionné l'appareil pour me proposer des conseils pour faciliter ma prise en main...(je n'en ai pas eu besoin, car l'interface utilisateur est parfaitement claire et l'appareil est "plug and play" . Je suis musicien et je l'utilise pour faire passer des musiques enregistrés de mon ipod a la sono pendant les pauses de nos spectacles, et pendant les repetitions aussi en utilisant mon ipod SANS FIL pour controler choix de musique et volume. C'est geniale. On peu se deplacer et garder le controle a tout moment. Rapport qualité prix imbattable. Avis spontané, non-solicité. Pierre

Bon article qui semble de très bonne qualité et qui arrive avec tous les cables nécessaires (mais pas de chargeur comme tous les petits appareils Bluetooth qui peuvent être rechargés sur une prise USB ou avec un chargeur de téléphone). J'ai pu l'appairer sans problème avec mon iPhone en mode récepteur (Rx) mais pas en mode transmission (Tx). Ceci est du au fait qu'Apple utilise un protocol particulier et breveté du Bluetooth 4.x (Low energy ou smart) qui n'est pas compatible dans ce sens avec le protocole standard. Je voulais appairer des prothèse auditives MFI (Made For iPhone) mais ça ne marche pas. Avis à ceux qui auraient la même idée... ========================================== Good device that looks sturdy and of good quality and that comes with all necessary cables (but without a charger as most BT devices nowadays as it can be easily charged with a phone charger or via your computer USB) I managed to pair the device with my iPhone in Receiver mode (Rx) without any problem but not in Transmitter mode (Tx). This is due to the fact that Apple uses a modified, proprietary BT 4.X protocol (Bluetooth Low Energy or BT smart) that is not compatible in this upwards direction (no problem in downwards direction when the Apple device is the transmitter and other BT device the receiver). I wanted to use this device to transmit sound from my Mac (not BT 4.x) or stereo directly into my BT hearing aids but it didn't work as these are MFI (made For Apple) and can only connect using the Apple BT protocol. Be aware if you have MFI HA's and would like to end sound directly to those.