A simple press on the central button of the device allows to start it, if there is enough battery, and to start sending positions in real time.

 

To turn off the device, you must stay pressed on the button for about 5 seconds, the leds of the beacon will have the following behavior: after 3 seconds the blue led will light up, then by keeping pressed, the red led will light up about 2 seconds later. You can release the button the device is off.