MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 5 with 20 Screws Engine Voltage Regulator Rectifier They not only provide optimal

They not only provide optimal security but also look more organized

5mm interface options

Easy to Write: Each one comes with a label and you can easily customize your labels

this screen door bar for campers reduces daily wear and tear

MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 5 with 20 Screws Engine Voltage Regulator Rectifier They not only provide optimalProduct Information: Product name: Surface mounted Magnetic Door Switch, Type: MC 31, Color: White, Material: Plastic Specification: Contact Type: NC, Hole Dia.: 5. 8mm, Actuation Distance: 8mm18mm Sizes: 64*12.*12mm and 64*20*12mmL * W * H),pack of 5 with 20 screws. NC Type: NC means normally closed. If the magnet is closed to this switch, the signal is conductive, otherwise, if the magnet is far away from this switch, the signal is disconnected.