K69 Bluetooth Headset Sound Conduction Binoconic Business Sports Earphone 1. Chip: BlueCom 2. Bluetooth pairing: K69 3. Bluetooth version: V5.0 4. Charging port: USB 5. Transmission distance: about 10m 6. Battery capacity: 90mAh 7. Alert tone: English 8. Life time: about 7-8H 9. Play time: about 3-4H 10. Weight: about 51.8g Features: 1. Three frequency balance, large dynamic unit, full and thick HIFI-level sound quality experience 2. Not into the ear design, wear solid, stable balance, movement is not limited 3. Lightweight body design, long wear without pain 4. HD microphone, intelligent recognition of environmental noise, restore clear human voice 5. Sound conduction technology, through the skull, jaw bone to the sound to the auditory nerve, low-frequency thick, mid-frequency delicate, high-frequency penetration 6. Memory titanium alloy skeleton, according to the size of different head adaptable shape, arbitrary distortion without deformation 7. IPX5 level waterproof design, fully enclosed sound cavity, to prevent daily sweat and rain infiltration, easy to clean material, simple wipe can 8. No sense of delay, all-round stereo sound, sound more spatial sense, high-speed connection, low power consumption 9. Widely compatible, support a variety of platforms music 10. Key operation, simple and convenient