2.5mm Male to 3.5mm Female Audio Adapter with Microphone for Nokia 5300/6300/5200/6120

Pros: - The sound quality is great. Using this adapter with an MWg Atom Life and Koss Plug headphones I used to listen to music and I could hear all perceivable frequencies nicely.

Cons: - The cable is a somewhat short – when I had my PDA in my pants, the clip attached to the top of my t-shirt, the cable was stretched and the PDA was literally hanging on it.
- The microphone was totally useless for me. I had to shout really loud while holding it before my mouth to be heard.
- The strain protection on the cable near the jack is too hard and thus useless, the cable will break really soon.

Other: This is a useful adapter if your main use for it is to listen to music. However, if you want to use the mic, I suggest sku.22829 instead.

Pros: This product works great.
i actually use this with my car's stereo.
i connect my phone to the AUX input in the stereo, and just leave the MIC hanging on the car-mount of the phone.
so i get a great HANDS FREE system in my car, the sound is just fine, and the MIC pics up the sound very well even though i put it on the wind-shield mount of the phone and not on my shirt.
people on the other side of the line claim they here me well.

Cons: as others said here before, if you want to put your phone in the pocket, then sometimes (depending on your pants) the mic will not get to the top of your shirt.
if you wanna use it mainly while walking around and not while driving, then you should buy :
http://www.dealextreme.com/details.dx/sku.22829
which is a bit longer and only about 10 cents more expensive (which is really cheap as well)

Other: very cheap and works great, cant go wrong with this price.
check out also :
http://www.dealextreme.com/details.dx/sku.22829