If your "Master Control Unit" starts beeping and the status tells you your "Motion Detector" has a “Low Battery”, it's time to replace the battery in your "Motion Detector".
Use AA 1.5 Volt Alkaline batteries with this product. Use popular brands like Energizer or Duracell.
A. Press the top tab to remove front cover from the backplate.
B. Press the two tabs at the top and one tab at the bottom to pull the front cover from the motion body.
C. Replace the battery or batteries in the motion body then replace front cover and remount motion on the backplate.