1.Compatible Bluetooth specification:V2.1+EDR 2.Standby time:600hours 3.Working sistance:up to 10 meters 4.Talk time 8-10hour Product Features:1,Compatible Bluetooth Specification V2.1+EDR 2,Operating Frequency Band: 2.4GHz ~ 2.48GHz unlicensed ISM band 3,Class 2 Output Power up to 10 meters 4,Support Headset and HandsFree profiles 5,Support Multiple paired,allows a speakerphone connect to two ...