1. Headset Wireless specification: Wireless V4.1, ISSC, support protocol Headset hands-free A2DP Avrcp. 2. Transmission range 10 meters. Transmission frequency 2.4GHz. 3. Charging voltage DC5V. Charging time is about 2 hours. 4. Battery capacity: 40mAh. Product size: L28*W14.5*H13mm. 5. Talk time 4.5 hours, 4.5 hours music time. Standby time 90 hours. Product net weight: 4g. 6. Battery level display supports Apple iPhone and some Android phones.
