Select a location between 4-20 ft from the window(s) you’d like to protect. Ensure the sensor will have a clear line of sight to the window(s). This location needs to be within 100 ft of the control panel to ensure proper communication. If you’re adhering the Glass Break Sensor to a flat wall or ceiling, make sure the mounting surface is clean and dry. Remove the wax backing from the adhesive pads and press and hold firmly against the wall or ceiling for 30 seconds. The sensor can also be placed on a table or a shelf.