Features: Support Bluetooth stereo music playback (A2DP) The use of noise reduction and echo suppression technology, any noisy environment is still excellent sound quality Long standby, standby time is about four days A key to boot paring, can memory automatically connect Specifications: Bluetooth version: Bluetooth 4.0 Support profiles: A2DP, AVRCP, hsp, HFP Transmission distance: up to 10 m (free space) Frequency range: 2.4 GHz-2.48 GHz Battery: 80 mAh Talk time: about 7hours Standby time: 160hours Playtime: about 7hours Cable length: 60 cm Charging time: about 2hours