Wb-7100h A wireless mono headset adopting bluetooth 2.0 technology Talk time : 4.5 hours Standby time : 150 hours Operating distance : 10 meters Multi-function button (pick up/ hang up/ reject calls) Volume buttons ( + for volume up, - for volume down) Blue led indicator Dimension : 68x18x12 (mm) Weight : 13g 1piece packing, 15g