... song l Compatible with most Bluetooth enabled devices, for example mobile phone, PDA, laptops, headset etc l External microphone for ... Processing) Technology for echo cancellation and background noise reduction Bluetooth Profiles Supported: Headset, hands free, A2DP and AVRCP Frequency: 2400. ... Up to 7 hours Standby time: Up to 180~200 hours Crystal clear sound quality Stereo Bluetooth Headset (B-828)