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https://m.ko.aliexpress.com/item/32857750115.html?trace=wwwdetail2mobilesitedetail&PID=8153558&cjevent=bfe807e1b29b11e98386049d0a18050c&af=8153558&cn=002&cv=11555457&dp=&aff_platform=promotion&cpt=1564471763480&sk=AqrBIUF6I&aff_trace_key=6f7719a8864a4ba7839ec7efa1e4822b-1564471763480-02174-AqrBIUF6I&terminal_id=e3f7e33e99964f0ca728db5f810763be
Specifications:
Bluetooth: 5.0
Effective Transmission Range: 10 meters/33 feet
Battery1: 300mAh Li-polymer Battery(Black Color)
Charging Time1: 2.5 Hours (maximum)
Working Time1: About 10 Hours
Standby Time1: Up to 200 Hours
Battery2: 500mAh Li-polymer Battery(Black-Red/Gray-Beige Color)
Charging Time2: 3 Hours (maximum)
Working Time2: About 30 Hours
Standby Time2: Up to 300 Hours
Diameter of Driver: 40mm
Frequency Range: 20Hz-20kHz
Sensitivity: 112+/-2 dB
Impedance: 32+/-15%¥Ø
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