Response from Tech Support

Dear Customer,

You will need to press the button 5-6 times to reset the sensor: 

1. Press the power button once to turn on the sensor. If the sensor is already on, turn it off first by pressing the power button once. 

2. Turn the sensor off quickly (in 1.5 seconds) before the LED light changes its color from white  

3. Press the button to turn on the sensor. Turn the sensor off quickly (in 1.5 seconds) before the LED light changes its color from yellow 

4. Press the button again to turn on the sensor. The LED should start to blink in white color. 

Here is a demo video: https://youtu.be/Vl-VlTkcaJE