Bluetooth version: V2.1+EDR,Chipset: CSR Bc4 Talk time: Up to ... Up to 120 SpecificationOperation range: Up to 10 metersBluetooth version: V2.1+EDR,Chipset: CSR Bc4Talk time: Up to 5 hoursStandby ... Up to 120 hours Weight About: 8 GramsDimensions(L x W x H): 45 x 20x 10 mm Battery type: Rechargeable Poly -Li ... , call redialMute, Transfer a call,volume adjustment, Voice-dial V2.1 Bluetooth mono headset