1. Driver: 15mm2. Impedance: 32 OHM3. Bluetooth version: Bluetooth v4.1+EDR4. Bluetooth use frequency band: 2.4GHz5. Power Level: CLASS II6. Output power: 30mW7. Bluetooth distance: 15 meters barrier-free8. Frequency response: 20-20000Hz9. Operating voltage range: 3.0V-4.2V10. Microphone sensitivity: -42dB11. With A2DP / AVRCP high quality stereo audio transmission and remote control protocol12. Powerful noise cancellation circuit (active noise reduction)13. Switch between Chinese and English (Do not connect to Bluetooth status when booting, double-press the switch 2 times, and hear the prompt tone switch successfully)14. Charging time is about 1 hour (power indicator charging: red light is on, full charge: red light is off (blue light is on).)15. Product size: diameter is 25MM. 15MM wide. 35mm high17. The talk time is about 2-3 hours.18 music time is about 2-3 hours19. Standby time is about 96 hours20. Charging time is about 60 minutes21. Battery capacity 55MAH22. Charging power supply: DC5V power supply [round hole interface] (computer USB port, mobile phone charger, car charger) undefined1. Listening to songs and phone calls, supporting listening to songs and making phone calls;2. Caller number, full intelligent English tone prompt, power on, pairing, power off the phone, etc.3.ios power display, after the iPhone is connected to the headset, there is a power display, you can watch the power of the headset at any time;4. One for two connections, the headset can connect two mobile phones at the same time;5. Each time the Bluetooth headset is connected to the phone, the Bluetooth headset will automatically connect back to the phone when it is turned on, which is convenient and faster.6. Compatible: Support all mobile phones, tablets and notebooks with Bluetooth function. Compatible with more than 100% of APP, player, TV, chat, etc.;