... Talking Time:3hrs Metal Case Wireless Bluetooth Single Earphone BH310 Size: 49X10 X4 mm Weight:9g Bluetooth Standard: ISSC 2.0 ... version, banwidth 3Mbps Wireless Frequency Range: Global-used 2. ... Support bluetooth: Receive/Reject/End a call, Voice dial, Last number redial , Mute Function, Volume Adjustment. Metal Case Wireless Bluetooth Single ...