E-Series Motion (TX-E721)
Find the tab at the top of the device.
Press the tab in.
Pull the cover away from the base. Be careful not to touch the little black square on the inside of the device as this will interfere with the motion detector’s effectiveness.
Locate the batteries.
Gently remove the batteries.
Note the battery terminals (+, -). Putting in a battery reversed can damage the device.
Place a new battery in the device (CR123A).
Ensuring that the hooks go in first, replace the cover on the device.
Press in until you hear a click.
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