1. Remove the sensor from the body by twisting the back plate counterclockwise
2: Insert the battery into the empty slot on the body of the CO detector.
3: Reconnect the back plate to the body by twisting the back plate clockwise.
4: Mount the CO detector on a wall in an area where you be able to hear the interior siren if there is an alarm.
Make sure the CO detector is within 75 feet of the control panel.
5: Mount the back plate to the wall using the screws included. Insert the screws in the areas marked below.