- Slide the alarm body off of the mounting plate to open the sensor
- Remove one of the batteries.
- Remove the front cover by gently pressing the clips on the side of the sensor. Exercise care to not break the clips.
- Press the tamper switch on the RF module inside the sensor and hod until you replace the battery.
- Replace the battery while still pressing the tamper switch, then release the switch.
- Reinstall the front cover. Be sure all four clips fully snap into place.
- Slide the alarm body back onto the mounting plate. The mounting plate will not close if all 3 batteries are not installed.