Overhead Mounted Switch with Magnet Heavy Duty Roller Shutter Contact Magnet Mounted on Bracket Wide Operating Gap 3" minimum 30-3/4" PVC 22AWG Cable with 21-1/2" armored sleeve 82mm x 55mm x 31mm for bracket 105mm x 45mm x 10mm for contact Not for AC voltage When the magnet is next to the switch, the loop is closed When the magnet is pulled away the loop opens Package of 1