Clip-on Wireless Bluetooth Earphone With Digital Charging Compartment 1. Bluetooth chip: Bluetooth 5656c2 2. Bluetooth version: V5.3 3. Transmission distance: about 10m 4. Battery capacity: 40mAh for headset, 350mAh for charging compartment. 5. Charging time: about 1h 6. Use time: about 6h 7. Frequency: 20Hz-20KHz 8. Impedance: 32 ohm 9. Sensitivity: 85dBmW 10. Waterproof rating: IPX 5 11. Material: PC+ABS 12. Charging compartment size: about 6 x 4 x 3.2cm 13. Weight: about 40.5g Features: 1. Not into the ear design, skin-friendly material, long wear without pain 2. Adaptive directional sound transmission, detect the shape of the ear canal, automatically adjust the integration to ensure that the sound is efficiently transmitted into the ear canal 3. 14mm titanium membrane moving coil, balanced full-frequency hearing, bass surging, treble transparent, delicate vocals 4. Adopting high elasticity skin-friendly material, adjustable clamping force, lightweight and comfortable, stable wearing, adjustable and stretchable, suitable for different ear shapes 5. Built-in memory titanium alloy wire, strong resilience, durability and non-deformation, anti-drop 6. Bluetooth 5.3 chip, low power consumption and energy saving, stable and smooth connection. 7. Touch operation, convenient and quick 8. ENC noise reduction technology, effectively reduce ambient noise and noise to eliminate wind noise, high-definition calls 9. Built-in high-capacity battery, long-lasting battery life