Products specification Bluetooth chip: Jerry AC6955F Standard:A2DP?AVCTP?AVDTP?AVRCP?HFP ?SPP?HID Channel mode: differential dual channel radio-frequency power:+2dBm receiving distance:≥10? working frequency:2.40GHz~2.480GHz Audio decoding mode:WAV WMA APE FLAC Modulation mode: frequency hopping operating temperature:.-40? --- 85? Operation humidity:10%~90% Headset Battery specification: 3.7V 300mAh- with guard plate Working Voltage:3.7V(3.2-4.2V) Earphone charging time: about 2H Maximum charging current of earphone:≤70mA Charging input voltage:DC5V±0.25V Head sensitivity:-43±3dB Horn sensitivity:113±3dB(S.P.L at 1 KHz) Horn specification:32Ω± 15% (40???) Sustainable call: 60% volume ≥8H Sustainable music playback: 60% volume ≥15H Standby time: ≥60H Working current of headset: 10.4mA (the higher the volume, the higher the current)e Current Consumption:2.2uA Match name: 5star-HDB100