Bluetooth headset * SPECIFICATIONS AND PARAMETERS: Main Chip：CSR Blue Core 02 Bluetooth v1.1 compliant class 2 Modulation：GFSK Hoping Rates：1600hops / sec Operation Frequency： ISM Band 2.400G~2.4835GHz Audio Range：300~3400Hz Voice Coding：13bit PCM Dimension：72mm X 24mm X 10mm Weight：10g Battery：115Mah 3.7V rechargeable (Lithium Polymer) Efficient Distance：10M Receiver Sensitivity：-80dbm0.1%BER Transmitter Power (Max)：-6dbm~+4dbm Operation Voltage：3.0V~4.2V Antenna gain：4dBi Operating Current：30mA(4 C 5 Hrs) Standby Current：2mA(Depend on Mobile type) Sleep mode Current：20uA (More than 2 weeks) Operating Humidity：5 to 85% Operating Temperature：-20℃~55℃ Storage Temperature：-20℃~85℃ Volume Level：16 Certification：BQB / FCC / CE