Cellularline INTERPHONE F4S, 2.1+EDR, Black, 10 h, Lithium, 3 h, 83 g Cellularline INTERPHONE F4S. Bluetooth version: 2.1+EDR. Product colour: Black. Talk time: 10 h, Battery technology: Lithium, Charging time: 3 h. Weight: 83 g, Width: 90 mm, Depth: 20 mm