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Feature Wireless and deal Wireless charging base Caller ID broadcast Battery level display(IOS) Specification Model No:B1 Bluetooth Version:4.1+EDR Frequency:2400.0-2483.5MHz Operation Range:10m Bluetooth Profiles:A2DP,AVRCP,Headset,Handsfree Talk Time: about 3 hours Music Time: about 2 hours Standy-By Time: about 40 hours Headset Size: 25.5x21x25mm Case Size: 91x44x33.6mm Headset Weight: 5g Case Weight: 290g