Remove the plunger gently from the door before changing the battery.
To remove the blue lid, squeeze, twist, and pull it off.
Locate the battery
Gently slide out the battery. You may use a flathead screwdriver if this proves difficult.
Note the battery terminals (+, -). Putting in a battery reversed can damage the device.
Place a new battery in the device (CR1620).
Replace the lid on the device, making sure that it is seated in all the way. Then return the device to the door
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