Does anyone know of a wireless headset similar to this one:

that'll work in the Treo600, that DOES NOT have a microphone? I would like to use my Treoo600 to listen to content between sets while I'm working out at the gym, but I don't want to look like some jerk that's so expecting a call at any moment that he has to have his headset (microphone + earpiece) in his ear at all times. I just want to look like I'm a normal guy listening to music etc. which means I don't want a microphone.