![Amazon.com: HWMATE NC Door Magnetic Contact Reed Switch Alarm for Roller Door Zinc Case (1 Pack) : Electronics Amazon.com: HWMATE NC Door Magnetic Contact Reed Switch Alarm for Roller Door Zinc Case (1 Pack) : Electronics](https://m.media-amazon.com/images/I/61KS5doriiL._AC_UF894,1000_QL80_.jpg)
Amazon.com: HWMATE NC Door Magnetic Contact Reed Switch Alarm for Roller Door Zinc Case (1 Pack) : Electronics
![Amazon.com : RC-35 NC/NO Recessed Wired Window Door Contact Sensor Alarm Magnetic Reed Switch for Office Home Security System, Sets of 5 : Electronics Amazon.com : RC-35 NC/NO Recessed Wired Window Door Contact Sensor Alarm Magnetic Reed Switch for Office Home Security System, Sets of 5 : Electronics](https://m.media-amazon.com/images/I/51MeUZtiyHL._AC_UF894,1000_QL80_.jpg)
Amazon.com : RC-35 NC/NO Recessed Wired Window Door Contact Sensor Alarm Magnetic Reed Switch for Office Home Security System, Sets of 5 : Electronics
![Magnetic Reed Switch RC-35 NC/NO Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Magnetic Reed Switch, Sets of 2: Amazon.com: Industrial & Scientific Magnetic Reed Switch RC-35 NC/NO Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Magnetic Reed Switch, Sets of 2: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/51PQX2OwiIL._AC_UF894,1000_QL80_.jpg)
Magnetic Reed Switch RC-35 NC/NO Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Magnetic Reed Switch, Sets of 2: Amazon.com: Industrial & Scientific
![Amazon.com: Magnetic Reed Switch MC-31B NC/NO Surface Mount Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Systems, Sets of 5, Black : Tools & Home Amazon.com: Magnetic Reed Switch MC-31B NC/NO Surface Mount Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Systems, Sets of 5, Black : Tools & Home](https://m.media-amazon.com/images/I/61yz0ayiYJL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Magnetic Reed Switch MC-31B NC/NO Surface Mount Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Systems, Sets of 5, Black : Tools & Home
![Amazon.com: Hxchen 3 Sets MC-31B NC & NO Door Window Contact Sensor Alarm Magnetic Reed Switch with Screws White : Tools & Home Improvement Amazon.com: Hxchen 3 Sets MC-31B NC & NO Door Window Contact Sensor Alarm Magnetic Reed Switch with Screws White : Tools & Home Improvement](https://m.media-amazon.com/images/I/51yJKUeOOgL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Hxchen 3 Sets MC-31B NC & NO Door Window Contact Sensor Alarm Magnetic Reed Switch with Screws White : Tools & Home Improvement
![Amazon.com: AUNMAS Wired Magnetic Door Window Contact Reed Switch, Door Window Magnetic Contact Wired Sensor Detector Switch for Home Garage Alarm Security : Electronics Amazon.com: AUNMAS Wired Magnetic Door Window Contact Reed Switch, Door Window Magnetic Contact Wired Sensor Detector Switch for Home Garage Alarm Security : Electronics](https://m.media-amazon.com/images/I/51J+BYOBokL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: AUNMAS Wired Magnetic Door Window Contact Reed Switch, Door Window Magnetic Contact Wired Sensor Detector Switch for Home Garage Alarm Security : Electronics
![Amazon.com: QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 10 with 40 Screws : Industrial & Scientific Amazon.com: QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 10 with 40 Screws : Industrial & Scientific](https://m.media-amazon.com/images/I/61ZyAelqRKL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 10 with 40 Screws : Industrial & Scientific
![Amazon.com: Dairzitv MC-31 Surface Mount Wired NC Door Contact Sensor Alarm Magnetic Reed Switch White 10pcs : Industrial & Scientific Amazon.com: Dairzitv MC-31 Surface Mount Wired NC Door Contact Sensor Alarm Magnetic Reed Switch White 10pcs : Industrial & Scientific](https://m.media-amazon.com/images/I/6116wbaMSkL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Dairzitv MC-31 Surface Mount Wired NC Door Contact Sensor Alarm Magnetic Reed Switch White 10pcs : Industrial & Scientific
![Amazon.com: BNYZWOT MC-34A NC (Normally Closed) Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch White - (5 Sets) : Tools & Home Improvement Amazon.com: BNYZWOT MC-34A NC (Normally Closed) Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch White - (5 Sets) : Tools & Home Improvement](https://m.media-amazon.com/images/I/615at-R1toL._AC_UF894,1000_QL80_.jpg)
Amazon.com: BNYZWOT MC-34A NC (Normally Closed) Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch White - (5 Sets) : Tools & Home Improvement
![Amazon.com: MC-31 Surface Mount Wired NC Door Contact Sensor Alarm Magnetic Reed Switch White 10pcs : Industrial & Scientific Amazon.com: MC-31 Surface Mount Wired NC Door Contact Sensor Alarm Magnetic Reed Switch White 10pcs : Industrial & Scientific](https://m.media-amazon.com/images/I/51+8mugKotL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: MC-31 Surface Mount Wired NC Door Contact Sensor Alarm Magnetic Reed Switch White 10pcs : Industrial & Scientific
![Amazon.com: Magnetic Reed Switch NC/NO Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Magnetic Reed Switch,Sets of 5 : Tools & Home Improvement Amazon.com: Magnetic Reed Switch NC/NO Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Magnetic Reed Switch,Sets of 5 : Tools & Home Improvement](https://m.media-amazon.com/images/I/61ytEE2Km1L._AC_UF894,1000_QL80_.jpg)
Amazon.com: Magnetic Reed Switch NC/NO Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Magnetic Reed Switch,Sets of 5 : Tools & Home Improvement
![Amazon.com: 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 : Industrial Amazon.com: 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 : Industrial](https://m.media-amazon.com/images/I/51+hj1KBDjL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: 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 : Industrial
![Amazon.com: TOWODE Wired Magnetic Surface-Mounted Door Window Contact Reed Switch Personal Gap Alarm, Cabinet Strip Light Switch NC DIY Kit, Pack of 10 with 40 Screws : Industrial & Scientific Amazon.com: TOWODE Wired Magnetic Surface-Mounted Door Window Contact Reed Switch Personal Gap Alarm, Cabinet Strip Light Switch NC DIY Kit, Pack of 10 with 40 Screws : Industrial & Scientific](https://m.media-amazon.com/images/I/6162mBfu1dL.jpg)
Amazon.com: TOWODE Wired Magnetic Surface-Mounted Door Window Contact Reed Switch Personal Gap Alarm, Cabinet Strip Light Switch NC DIY Kit, Pack of 10 with 40 Screws : Industrial & Scientific
![Amazon.com: UHPPOTE Normal Closed Wired Screw-Terminal Surface-Mount Magnetic Contact for Window Door Security (Pack of 5) : Electronics Amazon.com: UHPPOTE Normal Closed Wired Screw-Terminal Surface-Mount Magnetic Contact for Window Door Security (Pack of 5) : Electronics](https://m.media-amazon.com/images/I/616r6v5L+LL._AC_UF894,1000_QL80_.jpg)
Amazon.com: UHPPOTE Normal Closed Wired Screw-Terminal Surface-Mount Magnetic Contact for Window Door Security (Pack of 5) : Electronics
![Amazon.com: uxcell 5pcs Recessed NC Security Alarm Door Window Contact Sensor Magnetic Reed Switch : Tools & Home Improvement Amazon.com: uxcell 5pcs Recessed NC Security Alarm Door Window Contact Sensor Magnetic Reed Switch : Tools & Home Improvement](https://m.media-amazon.com/images/I/61u4taNYFJL._AC_UF894,1000_QL80_.jpg)
Amazon.com: uxcell 5pcs Recessed NC Security Alarm Door Window Contact Sensor Magnetic Reed Switch : Tools & Home Improvement
![Amazon.com: Mecion 12Pcs NC Surface Mount Wired Window Door Contact Sensor, ABS Door Window Sensor Alarm Magnetic Reed Switch : Tools & Home Improvement Amazon.com: Mecion 12Pcs NC Surface Mount Wired Window Door Contact Sensor, ABS Door Window Sensor Alarm Magnetic Reed Switch : Tools & Home Improvement](https://m.media-amazon.com/images/I/61R6BnGtP-L._AC_UF894,1000_QL80_.jpg)
Amazon.com: Mecion 12Pcs NC Surface Mount Wired Window Door Contact Sensor, ABS Door Window Sensor Alarm Magnetic Reed Switch : Tools & Home Improvement
![Amazon.com: Magnetic Reed Switch MC-31B NC/NO Surface Mount Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Systems, Sets of 5, White : Tools & Home Amazon.com: Magnetic Reed Switch MC-31B NC/NO Surface Mount Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Systems, Sets of 5, White : Tools & Home](https://m.media-amazon.com/images/I/515+2ZGx6KL.jpg)
Amazon.com: Magnetic Reed Switch MC-31B NC/NO Surface Mount Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, for Home Security and Burglar Alarm Systems, Sets of 5, White : Tools & Home
![Amazon.com: WMYCONGCONG 10 Pairs RC-33 N.C Recessed Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch : Tools & Home Improvement Amazon.com: WMYCONGCONG 10 Pairs RC-33 N.C Recessed Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch : Tools & Home Improvement](https://m.media-amazon.com/images/I/51QH10whJmL._AC_UF894,1000_QL80_.jpg)
Amazon.com: WMYCONGCONG 10 Pairs RC-33 N.C Recessed Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch : Tools & Home Improvement
![Amazon.com: Gebildet 10pcs Plastic Reed Switch Reed Contact Normally Open (N/O) Magnetic Induction Switch (3mm×14mm) : Industrial & Scientific Amazon.com: Gebildet 10pcs Plastic Reed Switch Reed Contact Normally Open (N/O) Magnetic Induction Switch (3mm×14mm) : Industrial & Scientific](https://m.media-amazon.com/images/I/61BRKNgYMsL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Gebildet 10pcs Plastic Reed Switch Reed Contact Normally Open (N/O) Magnetic Induction Switch (3mm×14mm) : Industrial & Scientific
![Amazon.com: Bstinay AC110-220V Door Window Reed Switch Black Normally Open Magnetic Door Contacts Switch : Electronics Amazon.com: Bstinay AC110-220V Door Window Reed Switch Black Normally Open Magnetic Door Contacts Switch : Electronics](https://m.media-amazon.com/images/I/61IWU10jccL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Bstinay AC110-220V Door Window Reed Switch Black Normally Open Magnetic Door Contacts Switch : Electronics
![Amazon.com : VictorsHome Magnetic Reed Switch RC-36 NC Recessed Wired Window Door Contact Sensor for Home Security and Burglar Alarm Systems 10 Pcs : Electronics Amazon.com : VictorsHome Magnetic Reed Switch RC-36 NC Recessed Wired Window Door Contact Sensor for Home Security and Burglar Alarm Systems 10 Pcs : Electronics](https://m.media-amazon.com/images/I/5135eK5Ez0L._AC_UF894,1000_QL80_.jpg)
Amazon.com : VictorsHome Magnetic Reed Switch RC-36 NC Recessed Wired Window Door Contact Sensor for Home Security and Burglar Alarm Systems 10 Pcs : Electronics
![Amazon.com : uxcell N.C. Recessed Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch White RC-33 10pcs : Electronics Amazon.com : uxcell N.C. Recessed Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch White RC-33 10pcs : Electronics](https://m.media-amazon.com/images/I/61oWKv66DjL._AC_UF894,1000_QL80_.jpg)
Amazon.com : uxcell N.C. Recessed Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch White RC-33 10pcs : Electronics
![Amazon.com : LBY 3 Sets Magnetic Reed Switch, Normally Open Closed Switch, Contact Reed Switch Personal Gap Alarm, Two-Hole(BS-2031), VDC100,with Screws, Plastic ABS Shell, White : Electronics Amazon.com : LBY 3 Sets Magnetic Reed Switch, Normally Open Closed Switch, Contact Reed Switch Personal Gap Alarm, Two-Hole(BS-2031), VDC100,with Screws, Plastic ABS Shell, White : Electronics](https://m.media-amazon.com/images/I/71DSC9SlMEL._AC_UF894,1000_QL80_.jpg)
Amazon.com : LBY 3 Sets Magnetic Reed Switch, Normally Open Closed Switch, Contact Reed Switch Personal Gap Alarm, Two-Hole(BS-2031), VDC100,with Screws, Plastic ABS Shell, White : Electronics
![Gebildet 10 Pezzi Reed Reed Contatto Reed, Magnete Vicino - Collegamento Circuito, Magnete Lontano - Interruzione Circuito, Induzione Magnetica Interruttore (3mm*14mm) : Amazon.it: Fai da te Gebildet 10 Pezzi Reed Reed Contatto Reed, Magnete Vicino - Collegamento Circuito, Magnete Lontano - Interruzione Circuito, Induzione Magnetica Interruttore (3mm*14mm) : Amazon.it: Fai da te](https://m.media-amazon.com/images/I/61BRKNgYMsL._AC_UF1000,1000_QL80_.jpg)
Gebildet 10 Pezzi Reed Reed Contatto Reed, Magnete Vicino - Collegamento Circuito, Magnete Lontano - Interruzione Circuito, Induzione Magnetica Interruttore (3mm*14mm) : Amazon.it: Fai da te
![Amazon.com: Gebildet 5pcs Recessed Wired Security Window Gate Contact Sensor Alarm Magnetic Reed Switch Black, Magnetic Door Sensor, Normally Closed Magnetic Switch : Industrial & Scientific Amazon.com: Gebildet 5pcs Recessed Wired Security Window Gate Contact Sensor Alarm Magnetic Reed Switch Black, Magnetic Door Sensor, Normally Closed Magnetic Switch : Industrial & Scientific](https://m.media-amazon.com/images/I/613cotuCBGL._AC_UF894,1000_QL80_.jpg)