1. Built-in reminder music: 8 songs
2. Bluetooth version: V4.0
3. Frequency range: 2.4GHZ-2.480GHZ
4. Rated power: 3W
5. Rated impedance: 4ohm
6. Working voltage: 3.7V
7. Bluetooth connection distance: >=10M
8. Battery capacity: 2000MAH
9. Charging voltage: DC5V
10. Sleep comfort music volume playing time: about 20 hours
11. Bluetooth music maximum volume playback time: about 6 hours
12. Rated charging time for audio: about 4 hours