This Garage Door Sensor takes 1 CR123A batteryand the typical battery life for the sensor is 3-5 years. If the Garage Door Sensor reports a low battery, follow these steps to change the battery:
1.
To open the sensor, press in on the plastic above the protrusion on one of the two short ends to open the cover and reveal the battery.
2.
Pop the CR123A battery out of the compartment and replace it with the new batteries positive end facing towards the spring. Ensure the spring is attached to the sensor before reinstalling the sensor cover.
3.
To replace the sensor cover on the base, put the bottom of the sensor together first and fold it closed. You should hear the casing snap into place.