WIWU Airbuds Optical Sensor Bluetooth 5.0 TWS Dual Host Design Wireless Bluetooth Earphone

1. Bluetooth version: 5.0 2. Talk time: 3.5 hours 3. Bluetooth transmission distance: about 10 meters 4. Battery capacity of charging compartment: 320mAh 5. Charging time: about 1.5 hours 6. Listening time: 4 hours 7. Ergonomic design, comfortable to wear 8. Compatible with smart phones, computers, tablets and other digital devices with Bluetooth 9. Adopt 13.2mm high-fidelity speakers, showing clear low, medium and high sound 10. In-ear listening to songs, smart sensor