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
Cable type
AUX Composite
Compatible devices
DVD Player
Connector type
Auxiliary RCA
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
Colour	Grey
Compatible Devices	DVD Player, Smartphone, Speaker, Tablet, Television
Connector Gender	Male-to-Male
Connector Type	Auxiliary, RCA
Customer Reviews	4.7 4.7 out of 5 stars (264)
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
Unit Count	2 Count

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