Plantronics 2.5mm & 3.5mm Stereo Music Headset Earphones White for Sprint Palm Treo Pro 850 Switch between music and calls easily with one button Clear conversations with AcuSpeak microphone technology AcuSpeak In-line Microphone can also initiate Voice-dial on voice-dial equipped cell phone models In-line mic reduces background noise, & increases the volume & clarity of your voice transmission Stereo Flex Grip ear buds fit comfortably, yet snugly onto the outer ear!