eSynicProfessional Headphone Amplifier With Bass Gain 16~300Ω Portable 3.5mm Audio Headphone Amp Rechargeble Volume Amplifiers with Aluminum Matte Surface for MP3 MP4 Phones and Computers etc

Worked perfectly with my MP3 player giving the volume a boost

Got this for my projector as the sound output wasn't loud enough. Works perfectly and it will work whilst on charge too!

There isnt much to it, connct your input into 3.5mm labelled input and the output to the 3.5 labelled output.Suepr easy to use just get it chargd up and twist the encoder clockwise to turn it on. There is a bass booster switch and it does work though admittedly I prefer not to turn on Bass Boost feature. This really will drive your headphones up to a very loud levlel and with no distortion or anomolies in the audio. I found it to be prety clean in the sound that passses through and I have enjoyed testing it with a few different pairs of headphones on varying types of music.The aluminium shell is of a n appropriate thickness that its neither too thin and flimsy nor to chonky and heavy.

Just received this mini amplifier which I use it in conjunction with my recently purchased mp3 player which I found wasn't quite powerful enough to drive my 70 ohm Sennheiser headphones this really does make a big difference to the enjoyment of the music it creates a much bigger sound stage then just the mp3 player alone I highly recommend this power amplifier to use with your phone or mp3 player your phone and mp3 player will require them to have a headphone socket though

Gives a really good glean bass - plenty of bottom end. Gives the music a full sound with no distortion and plenty of volume.

Required it to boost headphones when in a noisy environment like Wetherspoons

Only thing I wished that the audio input it was with lightning cable an usb C also.

PROS-robust construction-rechargeable battery (USB-C)-does a great job with my sub-standard audio setup (just on a computer)-I appreciate the included cables-not expensiveCONS-it’s small, but not _that_ small. I think it’d be a faff to carry around with a phone to enhance audio from there. Better used on a deskNOTES-I’m using this at my computer. It’s not exactly the professional environment that perhaps the developer thought it would be used in, but this really helps me get enough volume to listen to music and watch the occasional movie (bass boost is great for movies!).MY STAR RATINGS:1* substandard, mostly cons2** barely acceptable, cons outweigh the pros3*** meets the basic requirements, cons balance the pros4**** good product, pros outweigh the cons5***** exceptional, all (or almost all) pros