- Remove the sensor from the mounting bracket by pressing down the button on the top and swinging the sensor toward you.
- Press the 2 tabs on top of the sensor and the 1 button on the bottom, then pull the sensor straight out.
- Remove the old batteries.
- Wait 15–20 seconds.
- Install 2 replacement AA batteries.
- Slide the sensor back into its housing and place it back on the mounting bracket by putting the bottom in first and swinging the sensor up until it clicks into place.