Specification :
BT 5.0 
Working time : 3.5 hours 
Charging time : 0.5 hours 
Standby time : 100 hours 
Earbud battery : 35mah 
Charging box battery : 300mah 
With protection board inside 
 
Functions ：
1. Play/Pause/Answer/Hang up
2. Previous/Next
3. Caller number/last digit callback
4. Automatic pairing/automatic shutdown
5. Binaural call
6. Battery sync/low battery prompt
7. Touch operation
8. Power on/off voice prompt
9. Summon Siri voice