To power on the module, hold a magnet near the LED, let it touch the enclosure/LED; the LED will blink once. If the LED doesn’t blink, then the sensor is already on.
Remove the magnet immediately after the LED blinked. Do not leave the magnet near the LED more than 5 seconds.
If the magnet is near or around the LED more than 10 seconds, you will clear device settings and enter configuration mode.