Motorola MOTOROKR S9 HD Bluetooth Stereo Headset (Black) Compatible with mobile phone or MP3 player with Bluetooth Stereo profile (A2DP) Seamlessly switch between streaming music and incoming calls3D surround sound and high-definition acoustics 6 hours play time 7 hours talk time or 150 hours standby touch sensitive play/answer/end and volume controls Water- and sweat-resistant high-definition audio and ear buds that reduce background noise and improve comfort.