1) Turning your Motion sensor on
Your sensor is paired with your phone. It turns on by itself when you ask it to (you just need to shake it).
2) Turning your Motion sensor off
You sensor remains on standby until the battery dies. It does not have an off button.
The sensor has a battery life of 10 hours while in use and can go 2 months between charges while on standby.
Note: You can check the battery level at any time directly with your phone in the app's dashboard (In "Parameters", at the bottom on the right, then battery level is located next to "Motion").