A9 pro Display Airbuds

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