3.5mm Stereo Audio Headset Adapter/ Adaptor with Mic for HTC G2/ G1, MyTouch 3G, Touch Diamond, Shadow, Touch, XV6900, 8925 Tilt, SMT-5800, Fusion, PPC-6800, XV6800, Mogul, Wing, 8525, Dash, S620 Excalibur Smartphone Switch 3.5mm MP3 stereo hands-free to HTC cell phone hands-free With Micphone, add speak function to 3.5mm stereo headset Switch button, switch from music audio both ears to Mono single ear Mute switch, shut down micphone for listening function only