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$18.59
5Sets MC-31B Magnetic Reed Switch Wired Surface Mount Normally Open Closed NC NO Door Contact Sensor Alarm Magnetic Door Switch Black
Amazon.com
24
$18.59
5Sets MC-31B Magnetic Reed Switch Wired Surface Mount Normally Open Closed NC NO Door Contact Sensor Alarm Magnetic Door Switch Black
Amazon.com
24
$13.99
Victorshome Magnetic Reed Switch RC-33 NC Recessed Wired Window Door Contact Sensor For Home Security And Burglar Alarm Systems 10 Pcs
Amazon.com
105
$13.99
Victorshome Magnetic Reed Switch RC-33 NC Recessed Wired Window Door Contact Sensor For Home Security And Burglar Alarm Systems 10 Pcs
Amazon.com
105
$17.99
Uxcell Rolling Door Contact Magnetic Reed Switch Alarm With 3 Wires For N.O./N.C. Applications OC-55
Amazon.com
44
$17.99
Uxcell Rolling Door Contact Magnetic Reed Switch Alarm With 3 Wires For N.O./N.C. Applications OC-55
Amazon.com
44
$12.99
Heavy Duty Wired Alarm Garage Door Magnetic Contacts Switch Sensor NC With Adjustable Bracket
Amazon.com
146
$12.99
Heavy Duty Wired Alarm Garage Door Magnetic Contacts Switch Sensor NC With Adjustable Bracket
Amazon.com
146
$6.99
2 Sets MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch
Amazon.com
13
$6.99
2 Sets MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch
Amazon.com
13
$7.99
MC-31 NC Surface Mount Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch, For Home Security And Burglar Alarm Systems, Sets Of 3,
Amazon.com
11
$7.99
MC-31 NC Surface Mount Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch, For Home Security And Burglar Alarm Systems, Sets Of 3,
Amazon.com
11
$8.29
GDQLCNXB 2 Sets MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch
Amazon.com
6
$8.29
GDQLCNXB 2 Sets MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch
Amazon.com
6
$9.99
3 Sets Of Sensor Alarm Magnetic Reed Switch MC-38B NC And NO Embedded Magnetic Gap Switch White For Door And Window Sensors For Home Security
Amazon.com
7
$9.99
3 Sets Of Sensor Alarm Magnetic Reed Switch MC-38B NC And NO Embedded Magnetic Gap Switch White For Door And Window Sensors For Home Security
Amazon.com
7
$7.97
QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack Of 10 With 40 Screws
Amazon.com
433
$7.97
QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack Of 10 With 40 Screws
Amazon.com
433
$15.97
Aoje-Link MC-56 NC + NO Wired Magnetic Switch Door Window Reed Switch Micro Alarm Magnetic Contact Security Silver Gray 1Pcs
Amazon.com
$15.97
Aoje-Link MC-56 NC + NO Wired Magnetic Switch Door Window Reed Switch Micro Alarm Magnetic Contact Security Silver Gray 1Pcs
Amazon.com
$17.99
10 Sets Pack Of Wired Surface Mounted Alarm Magnetic Contacts Door Window Reed Switch Sensor With Double Side Tape
Amazon.com
284
$17.99
10 Sets Pack Of Wired Surface Mounted Alarm Magnetic Contacts Door Window Reed Switch Sensor With Double Side Tape
Amazon.com
284
$8.39
Dairzitv MC-31 Surface Mount Wired NC Door Contact Sensor Alarm Magnetic Reed Switch White 5 Pair
Amazon.com
3
$8.39
Dairzitv MC-31 Surface Mount Wired NC Door Contact Sensor Alarm Magnetic Reed Switch White 5 Pair
Amazon.com
3
$7.99
2 Pack Door Window Alarm, Magnetic Burglar Alert Sensor, Loud Door Alarms For Kids Safety, DIY For Home Security, Office Protection,Shopping Store
Amazon.com
$7.99
2 Pack Door Window Alarm, Magnetic Burglar Alert Sensor, Loud Door Alarms For Kids Safety, DIY For Home Security, Office Protection,Shopping Store
Amazon.com
$14.99
Magnetic Reed Switch MC-33C NC Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, For Home Security And Burglar Alarm Systems,
Amazon.com
17
$14.99
Magnetic Reed Switch MC-33C NC Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, For Home Security And Burglar Alarm Systems,
Amazon.com
17
$13.99
Hxchen 3Sets RC-35 NC & NO Wired Magnetic Door Window Contact Sensor Switch Contact Sensor Alarm Magnetic Reed Switch White
Amazon.com
$13.99
Hxchen 3Sets RC-35 NC & NO Wired Magnetic Door Window Contact Sensor Switch Contact Sensor Alarm Magnetic Reed Switch White
Amazon.com
$31.99
RC-36 NC/NO Magnetic Reed Switch Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, For Home Security And Burglar Alarm Systems,
Amazon.com
4
$31.99
RC-36 NC/NO Magnetic Reed Switch Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, For Home Security And Burglar Alarm Systems,
Amazon.com
4
$3.95
$9.09
Uxcell N.C. Recessed Wired Window Door Contact Sensor Alarm Magnetic Reed White HC34A
Amazon.com
56% off
$3.95
$9.09
Uxcell N.C. Recessed Wired Window Door Contact Sensor Alarm Magnetic Reed White HC34A
Amazon.com
$7.99
RC-36 NC Recessed Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch, For Home Security And Burglar Alarm Systems, Sets Of 3, Brown
Amazon.com
11
$7.99
RC-36 NC Recessed Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch, For Home Security And Burglar Alarm Systems, Sets Of 3, Brown
Amazon.com
11
$9.39
$9.99
Uxcell MC-38 Surface Mount Wired NC Door Sensor Alarm Magnetic Reed Switch White 2Pcs
Amazon.com
174
$9.39
$9.99
Uxcell MC-38 Surface Mount Wired NC Door Sensor Alarm Magnetic Reed Switch White 2Pcs
Amazon.com
174
$17.99
MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch - (6 Sets)
Amazon.com
$17.99
MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch - (6 Sets)
Amazon.com
$7.79
FOCMKEAS Magnetic Reed Switch Wired Surface Mount Normally Open/Closed NC/NO Contact Sensor Alarm Magnetic Door Switch With 3 Wires, PVC, MC-31
Amazon.com
$7.79
FOCMKEAS Magnetic Reed Switch Wired Surface Mount Normally Open/Closed NC/NO Contact Sensor Alarm Magnetic Door Switch With 3 Wires, PVC, MC-31
Amazon.com
$6.49
Biaungdo 4 Pcs Brown Wired Magnetic Contact Reed Switch, Surface-Mounted NC Sensor Alarm For Window, Cabinet, Wooden Door, With Screws
Amazon.com
14
$6.49
Biaungdo 4 Pcs Brown Wired Magnetic Contact Reed Switch, Surface-Mounted NC Sensor Alarm For Window, Cabinet, Wooden Door, With Screws
Amazon.com
14
$7.89
Bnafes Recessed Security Alarm Contacts Door Window Sensor Magnetic Reed Switch White 4Pcs
Amazon.com
47
$7.89
Bnafes Recessed Security Alarm Contacts Door Window Sensor Magnetic Reed Switch White 4Pcs
Amazon.com
47
$410.31
ALARM CONTROLS 1200D28 Double Magnetic Lock 12-24VDC Bond Sensor Door Status Sensor LED Status Indicator
Voomi Supply
$410.31
ALARM CONTROLS 1200D28 Double Magnetic Lock 12-24VDC Bond Sensor Door Status Sensor LED Status Indicator
Voomi Supply
$319.70
Alarm Controls 1200LB Electromagnetic Lock With Bond Sensor, Door Status Sensor & Status LED - For Single Door - 1200 Lbs
American Locksets
$319.70
Alarm Controls 1200LB Electromagnetic Lock With Bond Sensor, Door Status Sensor & Status LED - For Single Door - 1200 Lbs
American Locksets
$7.00
Honeywell 7939WG-WH Magnetic Contact, White
JMAC
347
$7.00
Honeywell 7939WG-WH Magnetic Contact, White
JMAC
347
$30.39
TECHKO Magnetic Sensor Alarm For Cabinet, Window, Or Door, S283
Zoro.com
30-day returns (most items)
$30.39
TECHKO Magnetic Sensor Alarm For Cabinet, Window, Or Door, S283
Zoro.com
30-day returns
$34.50
$59.00
Ajax Wireless Doorprotect Magnetic Door Opening Detector White
Shop Ajax Security
41% off
$34.50
$59.00
Ajax Wireless Doorprotect Magnetic Door Opening Detector White
Shop Ajax Security
$10.09
Door Window Alarm, Personal Security Window, Burglar Alarm, Home Security Wireless Magnetic Sensor Anti-Theft Alarm (2 Pcs) Home Alarm(Batteries Not I
Walmart
$10.09
Door Window Alarm, Personal Security Window, Burglar Alarm, Home Security Wireless Magnetic Sensor Anti-Theft Alarm (2 Pcs) Home Alarm(Batteries Not I
Walmart
$11.99
Door-Window-Alarm-Personal-Security-Window-Burglar-Home-Wireless-Magnetic-Sensor-Anti-Theft-Alarm-6-Pcs-Alarm-Batteries-Included
Walmart
$11.99
Door-Window-Alarm-Personal-Security-Window-Burglar-Home-Wireless-Magnetic-Sensor-Anti-Theft-Alarm-6-Pcs-Alarm-Batteries-Included
Walmart
$10.09
Door Window Alarm, Personal Security Window, Burglar Alarm, Home Security Wireless Magnetic Sensor Anti-Theft Alarm (4 Pcs) Home Alarm(Batteries Not I
Walmart
$10.09
Door Window Alarm, Personal Security Window, Burglar Alarm, Home Security Wireless Magnetic Sensor Anti-Theft Alarm (4 Pcs) Home Alarm(Batteries Not I
Walmart
$328.83
Alarm Controls 1200LB Single Door 1200 Pound Magnetic Lock With Indicating LED, Bond Sensor And Door Status Sensor 12VDC / 24VDC Aluminum
Door Hardware Center
60-day returns (most items)
$328.83
Alarm Controls 1200LB Single Door 1200 Pound Magnetic Lock With Indicating LED, Bond Sensor And Door Status Sensor 12VDC / 24VDC Aluminum
Door Hardware Center
60-day returns
$329.00
Alarm Controls 600LB Single Magnetic Lock With Bond Sensor, Door Status Sensor And Status LED
Keyless Access Locks
$329.00
Alarm Controls 600LB Single Magnetic Lock With Bond Sensor, Door Status Sensor And Status LED
Keyless Access Locks
$343.70
Alarm Controls 1200LBDURO Single Door 1200 Pound Magnetic Lock With Indicating LED, Bond Sensor And Door Status Sensor 12VDC / 24VDC Dark Bronze
Door Hardware Center
60-day returns (most items)
$343.70
Alarm Controls 1200LBDURO Single Door 1200 Pound Magnetic Lock With Indicating LED, Bond Sensor And Door Status Sensor 12VDC / 24VDC Dark Bronze
Door Hardware Center
60-day returns
$464.00
Alarm Controls 600DLB Double Magnetic Lock With Bond Sensor, Door Status Sensor And Status LED
Keyless Access Locks
$464.00
Alarm Controls 600DLB Double Magnetic Lock With Bond Sensor, Door Status Sensor And Status LED
Keyless Access Locks
$416.00
Alarm Controls 1200LB Single Magnetic Lock With Bond Sensor, Door Status Sensor And Status LED
Keyless Access Locks
$416.00
Alarm Controls 1200LB Single Magnetic Lock With Bond Sensor, Door Status Sensor And Status LED
Keyless Access Locks
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    Shop magnetic alarm sensor

    Sponsored
    About our ads
    $18.59
    5Sets MC-31B Magnetic Reed Switch Wired Surface Mount Normally Open Closed NC NO Door Contact Sensor Alarm Magnetic Door Switch Black
    Amazon.com
    24
    $18.59
    5Sets MC-31B Magnetic Reed Switch Wired Surface Mount Normally Open Closed NC NO Door Contact Sensor Alarm Magnetic Door Switch Black
    Amazon.com
    24
    $13.99
    Victorshome Magnetic Reed Switch RC-33 NC Recessed Wired Window Door Contact Sensor For Home Security And Burglar Alarm Systems 10 Pcs
    Amazon.com
    105
    $13.99
    Victorshome Magnetic Reed Switch RC-33 NC Recessed Wired Window Door Contact Sensor For Home Security And Burglar Alarm Systems 10 Pcs
    Amazon.com
    105
    $17.99
    Uxcell Rolling Door Contact Magnetic Reed Switch Alarm With 3 Wires For N.O./N.C. Applications OC-55
    Amazon.com
    44
    $17.99
    Uxcell Rolling Door Contact Magnetic Reed Switch Alarm With 3 Wires For N.O./N.C. Applications OC-55
    Amazon.com
    44
    $12.99
    Heavy Duty Wired Alarm Garage Door Magnetic Contacts Switch Sensor NC With Adjustable Bracket
    Amazon.com
    146
    $12.99
    Heavy Duty Wired Alarm Garage Door Magnetic Contacts Switch Sensor NC With Adjustable Bracket
    Amazon.com
    146
    $6.99
    2 Sets MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch
    Amazon.com
    13
    $6.99
    2 Sets MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch
    Amazon.com
    13
    $7.99
    MC-31 NC Surface Mount Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch, For Home Security And Burglar Alarm Systems, Sets Of 3,
    Amazon.com
    11
    $7.99
    MC-31 NC Surface Mount Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch, For Home Security And Burglar Alarm Systems, Sets Of 3,
    Amazon.com
    11
    $8.29
    GDQLCNXB 2 Sets MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch
    Amazon.com
    6
    $8.29
    GDQLCNXB 2 Sets MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch
    Amazon.com
    6
    $9.99
    3 Sets Of Sensor Alarm Magnetic Reed Switch MC-38B NC And NO Embedded Magnetic Gap Switch White For Door And Window Sensors For Home Security
    Amazon.com
    7
    $9.99
    3 Sets Of Sensor Alarm Magnetic Reed Switch MC-38B NC And NO Embedded Magnetic Gap Switch White For Door And Window Sensors For Home Security
    Amazon.com
    7
    $7.97
    QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack Of 10 With 40 Screws
    Amazon.com
    433
    $7.97
    QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack Of 10 With 40 Screws
    Amazon.com
    433
    $15.97
    Aoje-Link MC-56 NC + NO Wired Magnetic Switch Door Window Reed Switch Micro Alarm Magnetic Contact Security Silver Gray 1Pcs
    Amazon.com
    $15.97
    Aoje-Link MC-56 NC + NO Wired Magnetic Switch Door Window Reed Switch Micro Alarm Magnetic Contact Security Silver Gray 1Pcs
    Amazon.com
    $17.99
    10 Sets Pack Of Wired Surface Mounted Alarm Magnetic Contacts Door Window Reed Switch Sensor With Double Side Tape
    Amazon.com
    284
    $17.99
    10 Sets Pack Of Wired Surface Mounted Alarm Magnetic Contacts Door Window Reed Switch Sensor With Double Side Tape
    Amazon.com
    284
    $8.39
    Dairzitv MC-31 Surface Mount Wired NC Door Contact Sensor Alarm Magnetic Reed Switch White 5 Pair
    Amazon.com
    3
    $8.39
    Dairzitv MC-31 Surface Mount Wired NC Door Contact Sensor Alarm Magnetic Reed Switch White 5 Pair
    Amazon.com
    3
    $7.99
    2 Pack Door Window Alarm, Magnetic Burglar Alert Sensor, Loud Door Alarms For Kids Safety, DIY For Home Security, Office Protection,Shopping Store
    Amazon.com
    $7.99
    2 Pack Door Window Alarm, Magnetic Burglar Alert Sensor, Loud Door Alarms For Kids Safety, DIY For Home Security, Office Protection,Shopping Store
    Amazon.com
    $14.99
    Magnetic Reed Switch MC-33C NC Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, For Home Security And Burglar Alarm Systems,
    Amazon.com
    17
    $14.99
    Magnetic Reed Switch MC-33C NC Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, For Home Security And Burglar Alarm Systems,
    Amazon.com
    17
    $13.99
    Hxchen 3Sets RC-35 NC & NO Wired Magnetic Door Window Contact Sensor Switch Contact Sensor Alarm Magnetic Reed Switch White
    Amazon.com
    $13.99
    Hxchen 3Sets RC-35 NC & NO Wired Magnetic Door Window Contact Sensor Switch Contact Sensor Alarm Magnetic Reed Switch White
    Amazon.com
    $31.99
    RC-36 NC/NO Magnetic Reed Switch Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, For Home Security And Burglar Alarm Systems,
    Amazon.com
    4
    $31.99
    RC-36 NC/NO Magnetic Reed Switch Recessed Wired Door Window Alarm, Magneti Door Switch, Contact Sensor, For Home Security And Burglar Alarm Systems,
    Amazon.com
    4
    $3.95
    $9.09
    Uxcell N.C. Recessed Wired Window Door Contact Sensor Alarm Magnetic Reed White HC34A
    Amazon.com
    56% off
    $3.95
    $9.09
    Uxcell N.C. Recessed Wired Window Door Contact Sensor Alarm Magnetic Reed White HC34A
    Amazon.com
    $7.99
    RC-36 NC Recessed Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch, For Home Security And Burglar Alarm Systems, Sets Of 3, Brown
    Amazon.com
    11
    $7.99
    RC-36 NC Recessed Wired Security Window Door Contact Sensor Alarm Magnetic Reed Switch, For Home Security And Burglar Alarm Systems, Sets Of 3, Brown
    Amazon.com
    11