D9X Detachable Battery TWS Stereo Bluetooth Headset V4.2 Wireless Earbuds

Bluetooth Resolution4.2Sensitivity-42dBFrequency range20-20000HzWorking voltage3.2V-4.2VDrive8mmCharge time45minutes for earphone, 1.5-2hours for charge caseBattery capacity38mAh/per pieceMusic timeon

Model： D9X Detachable Battery TWS Stereo Bluetooth Headset V4.2 Wireless Earbuds

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Bluetooth Resolution	4.2
Sensitivity	-42dB
Frequency range	20-20000Hz
Working voltage	3.2V-4.2V
Drive	8mm
Charge time	45minutes for earphone, 1.5-2hours for charge case
Battery capacity	38mAh/per piece
Music time	one for 4-6 hours, and a set for 2-3 hours