Checking the remaining battery charge
You can check the remaining battery charge of the rechargeable battery.
When pressing the 
/
/
(Power, Answer, Play/Pause) button to turn on the main unit, the (Power) lamp on the main unit flashes twice in blue, then flashes in red. The remaining battery charge can be indicated by the lamp (red) flashing.
3 times 
- - : Remaining battery charge is high.
2 times - : Remaining battery charge is medium.
1 times : Remaining battery charge is low (needs to charge).
When the battery is almost empty
When turning on the main unit, you hear voice guidance indicating the low battery, and the (Power) lamp turns to red. When the battery becomes empty, the main unit sounds a warning beep, you hear voice guidance indicating to charge the battery, and the main unit is turned off automatically.
When using iPad/iPhone/iPod touch
When the main unit is connected to an iPad, iPhone or iPod touch that supports HFP (Hands-free Profile), it will show an icon that indicates the remaining battery charge of the main unit on the screen.
Compatible devices
iPad, iPhone and iPod touch (iOS 5.0 or later) supporting Hands-free-Profile (HFP)
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iOS 10.2 or later
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iOS 7.x / 8.x / 9.x
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iOS 5.x / 6.x
A: Remaining battery charge of the main unit
B: Remaining battery charge is high.
C: Remaining battery charge is medium.
D: Remaining battery charge is low (needs to charge).
