does this work the other way around? RCA (out) to Aux (in)?

Never tried that but I wouldn’t believe so. Probably blow the “transistorized” equipment up. I always assumed it was only one way. (The earphone/earbud/output jacks say just that.)

What is the outside diameter of the 3.5 mm aluminum case? I would like to know if this cable will fit in my phone case.

The 3.5 mm plug is pretty standard for headphone plugs and works for external speakers . I believe this generally the intended use for this cable. It will likely fit a cell phone headphone plugs but I haven't used it in that way.

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2-Pack RCA to 3.5mm AUX Cable, (6.6 Feet) 3.5 mm 1/8 to RCA 2-Male Headphone Jack Adapter Splitter Premium Stereo Audio Cord for Connects a Smartphone, Tablet, HDTV,or MP3 Player to a Speaker (Grey)

2-Pack RCA to 3.5mm AUX Cable, (6.6 Feet) 3.5 mm 1/8 to RCA 2-Male Headphone Jack Adapter Splitter Premium Stereo Audio Cord for Connects a Smartphone, Tablet, HDTV,or MP3 Player to a Speaker (Grey)

Product ID: 539518285

Details

Brand
MCSPER
Connector type
Auxiliary RCA
Cable type
AUX Composite
Compatible devices
DVD Player
Special feature
Braided Tangle

🎧6.6 ft premium length

🔗Dual-shielded, oxygen-free copper

🛡️10,000+ bend lifespan durability

Description

🎶 Plug in, stand out — audio clarity that keeps you connected!

PREMIUM BUILD QUALITY - Dual-shielded cables with oxygen-free copper ensure crystal-clear, interference-free sound.
PEACE OF MIND WARRANTY - Backed by a lifetime replacement guarantee and responsive customer support.
BIDIRECTIONAL SOUND FLOW - Switch audio direction with ease—smart device to speaker or DVD to headphones with simple plug swap.
SEAMLESS AUDIO CONNECTIVITY - Effortlessly link smartphones, tablets, and MP3 players to RCA-enabled speakers or receivers.
DURABILITY MEETS FLEXIBILITY - Double-braided nylon design resists tangles and withstands over 10,000 bends for long-lasting use.

This 2-pack of 6.6-foot RCA to 3.5mm AUX cables offers premium stereo audio transmission with dual-shielded, oxygen-free copper conductors and a durable double-braided nylon exterior. Designed for bidirectional use, these cables connect smartphones, tablets, and MP3 players to RCA-enabled sound systems with high fidelity and tangle-free convenience, all backed by a lifetime warranty.

Specifications

ASIN	B0B8Z854S7
Brand	MCSPER
Cable Type	AUX, Composite
Cable type	AUX , Composite
Colour	Grey
Compatible Devices	DVD Player, Smartphone, Speaker, Tablet, Television
Compatible devices	DVD Player, Smartphone, Speaker, Tablet, Television
Connector Gender	Male-to-Male
Connector Type	Auxiliary, RCA
Connector type	Auxiliary , RCA
Customer Reviews	4.7 out of 5 stars 260 Reviews
Item Shape	Round
Item Weight	0.09 Kilograms
Manufacturer	MCSPER
Manufacturer Part Number	rca-2
Number of Items	2
Other Special Features of the Product	Braided, Tangle Free
Recommended Uses For Product	Connecting devices with 3.5mm headphone jack to devices with RCA input for audio transmission
Recommended uses for product	Connecting devices with 3.5mm headphone jack to devices with RCA input for audio transmission
Special feature	Braided , Tangle Free
Unit Count	2 Count

Reviews

J**E

Perfect

Works perfectly! Great quality!

22.07.2026

V**E

Constructed well

While not a high end cable, this is very well made and hopefully will last longer than the years I have left on this blue marble.

22.04.2026

J**A

I like the quality

I like the quality. Feels tough. Should last me a long time.

1.06.2026

M**O

Great cable

Very well constructed, heavy duty

4.06.2026

J**.

I always look here first

Perfect for what I needed. Saved me from going all over town looking for adapters. Great price too

30.04.2026

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