4PCS Recessed Wired Security Window Door Contact Sensor, Normally Closed NC, Door Alarm Magnetic Reed Switch with 2 Wire, ABS White, RC-33

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Overview Brand : FOCMKEAS Color : White Item dimensions L x W x H : 0.87 x 0.37 x 0.37 inches Item Weight : 1.13 Ounces Control Method : Touch About this item 【Size】Body size(appro x.): 9.5*22mm/0.37"*0.87"(D*L),Cable length: 260mm/10.2", Action Distance:15-25mm/0.6"-1", package include 4 pairs. 【Material】The Magnetic Switch is made of flame-retardant ABS shell material, resistant to high temperature and not easy to deform. 【Normally Closed (NC)】Normally closed type with 2 wires. When the magnet together, the circuit is conductive( light on ); the circuit is not conductive ( light off ) if the magnet separates. 【Application】These are the door contact sensors that are in use with any and all commercial or residential card access systems as well as all security burglar alarm system. The door contact can be used with an access control or anti-theft alarm system. 【Note】The Magnetic Door Switch must be installed as per the sensing distance. It can only provide a switch signal to the transmitter. It can't directly load the power, nor directly connect the lamp. Show more