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The batteries are low in the Room Sensor and they will probably only last for another few weeks before the sensor stops working altogether.

First, remove the front cover of the Room Sensor by placing a tool (such as a flat-bladed screwdriver) into the top of the sensor until you hear a click. This will release the catch.

Pull the white (front) of the room sensor away from the clear (back) and allow the cover to swing down (be careful not to pull the sensor off the wall).

The front is hinged at the bottom.

Remove the CR123 battery by pushing it lightly against the spring.

Wait 30 seconds before putting in the new battery.

Put in the new CR123 battery.

The light will flash once every second for 30 seconds.

Now the old Dual Channel Receiver needs to be removed from the list of devices as this no longer exists. Select the old Dual Channel Receiver from the list

Wake the device by pressing the black button at the top left of the device once.

To return the cover click it in at the bottom of the device and allow it to hinge up until there is a click as the top locks the cover in place.