M-F9 Rotatable Ear-mounted ENC Call Noise Reduction Bluetooth Stereo Sports Earphones Features: 1. Skin-friendly silicone open design, soft and ear-friendly, more comfortable to wear 2. Directional sound transmission technology to protect privacy and prevent sound leakage 3. Use dual-channel low-latency technology to achieve ultra-low latency for binaural connection, faster and more stable 4. Liquid silicone comfortable and rotatable elastic ear hooks that can adapt to different auricles 5. Using a 14mm dynamic driver unit, combined with AAC and SBC high-definition lossless decoding technology, the bass is powerful, the midrange is clear, the treble is loud, and the overall sound quality is good. 6. 360-degree panoramic surround sound, a shocking experience like a live scene 7. ENC noise reduction for clear calls, dual microphone directional radio, clear calls Product parameters: 1. Material: PC+ABS, electronic components 2. Functions: waterproof, breathing light, long battery life, call function, voice control, music support 3. Bluetooth version: 5.3+EDR 4. Transmission distance: 10 meters 5. Wireless frequency: 2.4GHZ 6. Supported protocols: A2DP1.3HFP1.6HSP1.2AVRCP1.6D11.3 7. Battery capacity: 75 mAh 8. Talk time: about 15 hours 9. Listening time: about 15 hours 10. Standby time: 120 hours 11. Charging time: about 1 hour 12. Charging voltagecurrent: 5V1A 13. Speaker impedance: 14mm, 32 ohms 14. Call sensitivity: 42db 15. Working temperature: minus 10 degrees Celsius - 50 degrees Celsius 16. Net weight of headphones: 6 grams