Our review:Item Description:Sony's RK-G138 Audio Connecting Cord features a headphone extension cord to allow listening at a greater distance as well as conversion between the stereo mini plug and the stereo phone plug. The RK-G138 also connects the Stereo UniMatch plug to Stereo mini jack (9ft 10in / 3m).
Amazon.com Item Description:The RK-G138 connecting cable will allow for a few significant connections. First, you can use the cable to extend your headphone cord, allowing you to be further away from the sound source. You can also use the RK-G138 as a conversion between a stereo mini-plug and a stereo phone plug. Finally, you can connect a stereo UniMatch plug to a stereo mini-jack. However you choose to use this connecting cable, you will three meters (9.8 feet) to do so with. This long extension will greatly increase your ease of movement and provide more mobile listening pleasure.
What's in the Box Sony RK-G138 connecting cable
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Buyer Testimonials
Average Buyer's Review:
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Sony Headphone Extension Cable
I got what I ordered (RK-138 Audio Connecting Cable) exactly when it was estimated to arrive and it works perfectly - can't ask for more than that.
Buyer's review: -
Great
I purchased this to extend my headphones so I can listen to TV in bed without disturbing the others in my household - it works great!
Buyer's review: 
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Sony RK-G138 Heaphone extension cord
I like the fact the cord is a little bit thinner than some other brands. I don't want a heavier thicker cord. I wish the plugs were smaller, so I gave it 4 stars.
Buyer's review: -
Well made
This worked well on the first generation iPhone, and is no longer necessary for the iPhone 3G.
Buyer's review: -
Excellent product, good value.
After originally purchasing a 6 ft "Cable to Go" and discovering it was garbage, I purchased the Sony extentsion cord. It works great. I use it at work to listen to music from my PC. The cord is long and flexible enough to allow me to move around while wearing my headphones. The connections are tight and the sound quality is not affected with use of this extension cord. This cord is a few more dollars than the "Cable to Go", but very much worth the money. I highly recommend this product.