YYK-525 Simple Version Single Rotatable Earhook Noise Reduction Call Business Bluetooth Earphone without Charging Box

1. Bluetooth version: V5.0+EDR 2. Wireless frequency: 2.4GHZ 3. Support protocol: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3 4. Transmission distance: 10m 5. Headphone battery capacity: 50mAh 6. Headphone charging voltage/current: 5V/1A 7. Play/talk time: about 4 hours 8. Charging time: about 1 hour 9. Standby time: 120 hours 10. Speaker impedance: diameter 8mm, 32 ohms 11. Microphone sensitivity: -42dB 12. Working temperature: -10-50 degrees Celsius