Use this heavy-duty magnetic Garage Door Contact Switch on garage doors, roll-up doors and other doors or gates where it may be difficult to mount regular magnetic contacts. Smaller magnetic switches have a small operating gap where the contact and magnet must be within half an inch for reliable operation. While those switches are fine for most doors and windows in a home, they just won't cut it for larger doors. These contacts can be as far as 2 3/4 inches apart and still operate.The sensor mounts to the floor and is made of a heavy-duty polished aluminum die-cast housing. The contact switch is completely sealed with in this housing. On your door or gate, mount the magnet to complete the system. It is mounted on an adjustable L-bracket and is easily adjustable horizontally and vertically. A flexible 24" stainless armored cable protects the wires as they run along the ground or up the wall. Trigger Lights or Appliances When Your Garage Door is Opened Connect the wires from this magnetic contact to an EZIO 2 Input/4 Output Relay Controller and you can trigger INSTEON-enabled devices anywhere in the home.