Bluetooth Version: 2.1 + EDR Frequency Range: 2.4GHz Transmission Power: Class 2 Operating Voltage: 3.6V Operating Current: 25 mA Standby Current: 0.04 mA Tramission Distance: Max. 10M Charging Time: 3~4H Talking Time: Upto 4H Standby Time: Upto 100H Dimensions: 4.8 cm x 1.5 cm x 2.0 cm Weight: 7 g