Heat Sensor (HDX-135 or HDX-200 or HDX-135Z)

You will need a CR123A Battery

1.

Twist the cover counter clockwise and remove it.

2.

Locate the battery.

3.

Gently remove the battery from its connections.

4.

Note the battery terminals (+, -). Putting in a battery reversed can damage the device.

5.

Place a new battery in the device (CR123A).

6.

Place the cover back on the base.

7.

Twist clockwise until you hear a click.

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