bluetooth headset H800 Technology Standard: Bluetooth V2.0 Chipset: BlueCore4-Audio Single Chip Compatibility: General Headset and Bluetooth Cell Phone Radio Performance: Class 2 Carrier Frequency: 2.4-2.480GHz Rx Sensitivity: <-75dBm Spread Spectrum: 10 meters Voice dial, receive, end or reject calls, adjust the volume Powder Charger: Input 100-240VAC, Output 5VDC Working Volt: 3.7V Battery: Rechargeable Li-polymer Inside Charging Time: 2-5hs Talking Time: 5hs Standby: 150hs Appearance Package Size: 170*140*55mm Headset Size:49*26*16mm Headset Weight: 15g Packing Quantity: 50 PCS/box