1. Charging voltage: DC5V working voltage: 3.7V.
2. Speaker: 16 ohm.
3. Frequency response: 80hz-20Khz.
4. Signal-to-noise ratio: 80-90dB.
5. Transmission distance: 10m.
6. Features: waterproof and dustproof, silicone earring, soft and comfortable, music and call control.