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1. Product weight: 4-5g (single earphone).
2. Working time: 3-4 hours.
3. Standby time: 100/h for one ear and 60/h for both ears.
4. Charging time: 1-2 hours.
5. Single earphone battery capacity: 35mAh.
6. The charger box Betty: 400mah.
7. Wireless working distance: 10m
8. Frequency response: 20-20000Hz
9. Impedance: 32Ω ± 20 percent
10. Sensitivity: 103±3dB
Shipping from China by sea