Bluedio TWS T-elf Bluetooth Version 5.0 In-Ear Bluetooth Headset with Headphone Charging Cabin, TWS T-elf

1. Bluetooth version: 5.0
2. Transmission distance: 10 meters
3. Battery type: built-in lithium polymer rechargeable battery
4. Function: Voice over IP: Support
5. Music playback: support for devices with Bluetooth
6. One for two functions: support
7. Voice prompts: Four language tips
8. Caller ID: Not supported
9. Standby theoretical time: up to 249 hours
10. Call theory time: up to 12 hours