... Compatible with most Bluetooth enabled devices, for example mobile phone, PDA, laptops, headset etc l External microphone for hand-free conversation from ... for echo cancellation and background noise reduction Bluetooth Profiles Supported: Headset, hands free, A2DP and AVRCP Frequency: 2400.0-2483.5MHZ ... to 180~200 hours Crystal clear sound quality Stereo Bluetooth Headset (B-828)