Checking the battery level
On the sensor
Turn on the sensor and press the 
button briefly. The blinking pattern of the red light shows the remaining charge.
- Blinking 3 times: Sufficient charge
- Blinking twice/once: The battery level is getting low. The fewer the blinks, the lower the charge.
- Fades as it blinks 3 times: Battery level very low. Charge the battery.
On the app
BLUETOOTH connect the sensor and your smartphone. Open the app and tap 
on the app's home screen to see the battery level.
- The remaining battery level is shown.