1. Stereo two channel 2. Transmission frequency rate: 2.4-2.48GHZ. Transmission range: 10 meters, 4. Support agreement: A2DP/HFP/HSP/AVRCP 5 batteries, polymer 60MA. Continued to call time of less than or equal to 3 hours 7. Continuous standby time: less than or equal to 120 hours of continuous music playback time: less than or equal to 2.5 hours. The charging time: is more than or equal to 2 hours. The charging voltage: 5V