1. Chip: Jerry 7003D8 noise reduction + light sensing in-ear detection2. Version: 5.4 [binaural call]3. Working frequency: 2.402-2.480GHz,4. Support protocols: A2DP/AVRCP/HFP/HID/AVCTP/AVDTP, and SPP5. Transmission distance: 15M [barrier-free]6.Response frequency: 20～20000Hz7.Speaker unit: ΦF13 titanium film, 32Ω±15%, 7.118±3DB 5mW8.Microphone: 2718 silicon microphone -42±3dB9.Charging input standard: contact, DC4.75-5.25 V/600MAH10.Battery type: 3.7V polymer battery 500mAh with protection board (3C fast charging battery), headphone battery 30mah11.Charging time: 1h12.Headset working time: the measured 100% volume plays continuously for about 5.5 hour