Avantree Bluetooth Motorcycle Headset HM100-US Bluetooth V2.1, Support profiles: Headset profile and hands free profile, Operation Range: Class 2, 10 meters Talk time: up to 7 hrs, Standby time: up to 220 hrs, Charging time: About 2 hours, Charging voltage: DC 5V Dimensions: Main body: 81mmX42mmX18mm, Microphone arm: 230mm, 	Weight: 49.5g Pairing, Transfer a call between mobile and headset, Switch between 2 mobile calls