M200 Open-Ear Wireless Bluetooth Headphones Ear-Hook Earphone Waterproof Earpieces 1. Cloud-sensing ear hook, no pain after long-term wearing, stable and comfortable listening 2. Directional sound transmission technology: automatically adjusts the sound propagation angle, protects privacy, and prevents sound leakage 3. Intelligent noise reduction: dual microphone noise reduction technology, making video calls like face-to-face 4. Bluetooth 5.4 chip, simple and fast connection, faster and more stable 5. ACS panoramic surround sound, high elasticity composite diaphragm, restores shocking sound quality 6. Automatic connection after opening the cover and taking out, both left and right earphones can be used independently 7. Intelligent digital display, real-time power control Parameters: 1. Bluetooth version: version 5.4 2. Bluetooth chip: Jerry chip 3. Headphone battery: 50mAh 4. Charging compartment battery: 300mAh 5. Charging time: about one hour 6. Playing time: about 5 hours 7. Frequency: 20Hz-20KHz 8. Impedance: 32 ohms 9. Sensitivity85dBmW 10. Waterproof level: IPX5