1. Bluetooth solution: FM TF Over ear Bluetooth Headphone 2. Bluetooth version: Bluetooth 5.0 IPX4 waterproof 3. Bluetooth support protocol: HFP1.6 A2DP1.2.AVRCP1.4 4. Audio frequency range: 20Hz ~ 20KHz 5. Bluetooth distance: 15 meters 6. Driver: ¢40*2 speaker 32 ohm with Bass 7. Microphone: High-intensity capacitive microphone 4X1.5mm 8. Mobile phone connection: one for two functions. 9. Battery capacity: 500mAh. 10. Charging time: about 2.5 hours 11. Charging voltage: DC 5V 12. Talk time: 16 hours 13. Play time: 14 hours 14. Standby time: up to 300 hours 15. SNR: above 80dB. 16. Distortion: less than 3%. Material: Imitation protein skin + steel strip + ABS + Silicone