In the B version (this can be identified from the serial number), if the camera or monitor are switched off or disconnected from the power supply, the notification may have expired.

You can then reactivate the motion detection. 

This is done by briefly changing the sensitivity and either switching it back or switching it off.

If you have any additional questions, you can always contact us via this website

Please make sure to clearly state your question or complaint so that we can provide you with the best possible service.