MC-31B NC & NO Door Window Contact Sensor Alarm Magnetic Sensor Reed

Application: Magnetic door contact reed switch great for door alarm sensor, alarm, LED Switch, Relay, GPS low voltage devices., ., ., etc. Effective for Theft Deterrence. 10PACK 31B SECURITY Magnetic Door Contact Reed Switch w/ Terminals... NO means Normally Open:when the magnet separate, the circuit is not conductive( light on );When the magnet together, the circuit is conductive ( light off ). Description: Product Name: MC-31B Magnetic Door Contact Reed Switch Feature: A reed switch is an electrical switch operated by an applied magnetic field. weideer 2pcs C-31B agnetic Reed Switch Wired Surface ount Norally jing Magnetic Reed Switch MC-31B NC & NO Surface Mount Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Magnetic Reed Switch,Sets of 5 Here with our 90-day money back risk-free purchase guarantee, Refund or Replacement for any quality problem. Product Name: Magnetic Door Contact Reed Switch; Color: White; Material: ABS., Product Size: 55 x 12., 5 x 11mm / 2., 2 x 0., 49 x 0., 43(L*W*H); Mounting Hole Size: 7 x 2., 5mm/ 0., 28 x 0., 1(L*W). Yes ideal wooden door or window use. Door Window Alarm Sensor MC-31B NC & NO Door Window Contact Sensor Alarm Magnetic Sensor Reed NC NO Contact Switch Package Content: 5Sets x MC-31B Magnetic Door Switch,Some Mounting Screws.