2.5mm (3/32 inch) female to Smartphone 3.5mm (1/8 inch) male
For use with 3.5mm plug on iPhone 3G/3GS, Blackberry Curve/Storm/Bold, Motorola Droid, Palm Pre
Phone Headset to iPhone/Blackberry/Smartphone Adapter
Reduce Electromagnetic Radiation (EMR) caused by cell phones and bluetooth headsets
Mono-channel (as are most 2.5mm headsets)

Product Description100% Guaranteed to Work IF you buy it from one of these authorized sellers: Webko, Ace Photo Digital, or SampleRewards.
If you’ve already have a nice 2.5mm phone headset, why buy another expensive headset for your smartphone? Just buy the Headset Buddy for Smartphones and save yourself money! Just plug in the phone headset adapter and use your existing phone headset with a 2.5mm mic/audio plug on your 3.5mm smartphone jack. Works with iPhone 3G/3GS, Blackber… More >>
Headset Buddy Adapter: 2.5mm Adapter – Convert 2.5mm Headset to 3.5mm iPhone, Blackberry, Droid, Palm