BT5 Bluetooth 5.0 Headband Headset 1. Battery capacity: 250mAh 2. Bluetooth version: 5.0 3. Frequency range: 2.4GHz-2.48GHz 4. Operating range: up to 10m (no obstacle space) 5. Support protocol: A2DP, AVRCP, HSP, HFP 6. Driver unit: 57mm x 2 7. Frequency range: 20Hz-20KHz 8. Impedance: 16 ohms 9. Distortion: about 0.3%-3% (THD) 10. Sensitivity: 118dB 11. Audio resolution: up to 24Bit@48KHz 12. Bluetooth musiccall time: about 15-20h 13. Standby time: about 1000h 14. Charging time: about 2h 15. Input voltagecurrent: 5Vmore than 500mA 16. Output power: 30mW+30mW Features: 1. Simple and textured, artificial leather skin-friendly ear pads, comfortable to wear 2. Adjustable up and down the sliding pole to make wearing a more intimate, high-density memory foam all-inclusive earmuffs, soft and skin-friendly, long wearing not stuffy ears, lightweight and breathable, lightweight design 3. Automatic boot pairing, boot that is connected, Bluetooth 5.0 chip, 10 meters long-distance stable transmission, rapid connection, low-power consumption without lagging 4. Easily connect to different platforms or devices, compatible with Windows, Android and iOS systems 5. Support wired use, support 3.5mm to Type-C audio cable headphone jack, suitable for cell phones, tablets, laptops, PC computers and other devices with 3.5mm interface 6. 57mm large dynamic circle, large diameter composite sound unit, sound quality greatly improved, bass more surging 7. Built-in microphone function, you can make and receive calls, HD microphone effectively filter out the noise, voice is clearer, the call is more unobstructed