Plantronics Discovery 975 Bluetooth Headset - NO Charging Case - Bulk Packaging Superior sound performance with two noise-canceling mics. Bluetooth earpiece combines easy-to-use operation with outstanding sound quality Patented gel ear tip offers great comfort and a secure fit Simply turn your phone's Bluetooth feature on, turn the earpiece on, and follow the commands on your phone. Meanwhile, AudioIQ2 technology automatically adjusts incoming calls to clear, comfortable listening levels.