H2 Colorful Luminous Subwoofer Folding Retractable Card Wireless Bluetooth Headset 1. Adopt stainless steel wire drawing telescopic head beam design to strengthen the toughness between the headset and the head beam 2. 40mm large moving coil unit, strong bass 3. Lightweight and durable, foldable storage, long-lasting battery life 4. Colorful breathing light, one key to turn onoff the light 5. Bluetooth 5.0 chip, fast connection, stable transmission, stable signal 6. All-inclusive cover for comfortable noise shielding 7. Binaural stereo design, listening to voice 8. Ergonomic head-wear design, fits the head shape and is comfortable to wear 9. Three modes of card, bluetooth and cable 10. Battery capacity: 650mah 11. Power supply mode: USB charging built-in lithium battery 12. Charging time: 2-3 hours 13. How to use: head-mounted 14. Use time: about 24 hours 15. Standby time: about 300 hours 16. Rated power: 5W 17. Rated current: 1A 18. Charging voltage: DC 5V 19. Frequency response: 20-20000Hz 20. Channel: Stereo 21. Impedance: 32 ohms 22. Function: battery display, call function, voice control, support music 23. Transmission range: 10 meters 24. Size: 18x19x7.5cm 25. Weight: about 228g