The size of this headset is smaller, so it is more suitable for children and young people, or users with smaller head can consider it. Parameter: ♪ 1. Driver: 40mm ♪ 2. Impedance: 32 OHM ♪ 3. Bluetooth version: Bluetooth v5.0 ♪ 4. Bluetooth Usage Band: 2.4 GHz ♪ 5. Power Level: CLASS II ♪ 6. Bluetooth Distance: Barrier-free 10 meters ♪ 7. Frequency response: 20-20000Hz ♪ 8. High-quality stereo audio transmission and remote control with A2DP/AVRCP Agreement ♪ 9. Charging time is about 2 hours (power indication charging: red light on, full)Electricity: The red light goes out (the blue light goes on). ♪ 10. Call time is about 8-10 hours ♪ 11. Music time is about 8-10 hours ♪ 12. Standby time is about 120 hours ♪ 13. Battery capacity 250MAH + protection panel ♪ 14. Charging power supply: DC5V power supply [round hole interface] (computer USB port,Mobile phone charger, car charger) ♪ 15. Compatible mobile phones: 99% compatible with Android, Apple, Microsoft and Symbian systems If you have any questions, please contact us in time. We will help you within 24 hours after receiving your email.