ABS 10 x RC-33 NC Wired Door Contact Sensor Alarm Magnet Reed Switch
$13.20
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Sensors & Motion Detectors
Motion, door/window and glass-break sensors are the trip-wires of a security system. Check what hub or panel they pair with (many are brand-specific and won't mix), wired vs wireless, and battery life for wireless units. For motion sensors, pet-immune designs avoid false alarms. Buying spare or used sensors is fine — just confirm the protocol and that they're compatible with your system.
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Wall Mount 24.125GHz Human Inductive Motion Microwave Radar Sensor For Elevators
$19.94
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X-10 RoboDog Barking Dog Alarm Model SD20A
$39.99
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SALE Smart Thermometer Hygrometer Wi-Fi Temperature Humidity Sensor For Alexa/Google
$19.17$22.03
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SALE Simple Water Leak Alarm Flood Level Overflow Detector Sensor Home Security
$10.03$11.53
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KERUI Driveway Alarm Wireless System Outdoor Motion Sensor for Home Security USA
$37.99
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SALE Qolsys QS1231-840 IQ Wireless PIR Motion Sensor, Interlogix Compatible———-19
$32.49$49.99
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Solar Wireless Driveway Alarm System, 1/2 Mile Range, IP65 Weatherproof, 120dB
$75.71
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5 Sets RC-33 NC Magnetic Door Switch Security Contact Sensor Alarm - White
$16.99
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Automatic Water Leak Detector with Sensors and Shut-off Valve
$74.67
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5-Pack Recessed Wired Security Magnetic Door Window Contact Sensor Alarm
$18.99
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SALE HOMSECUR Wireless PIR Motion Detector Human Body Infrared 433MHz Home Security
$44.07$46.39
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Recessed Door Sensor for Monitoring Open/Closed Status with HomeKit & Alexa
$51.99
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TECKNET Solar Wireless Driveway Alarm with 2600FT Long Range & 36 Melodies & 5 V
$35.00
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SALE Reliable Solar Driveway Alarm System: Wireless, Weatherproof & Easy to Install
$37.95$40.61
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3 Sets White Iron Door Recessed Wired Security Contact Sensor Alarm
$15.99
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Wired Magnetic Door Window Contact Sensor Set for Home Security, White
$15.99
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Recessed Wired Magnetic Door Contact Sensor Alarm - 10 Sets, White
$23.99
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MC-33C Recessed Magnetic Door/Window Contact Sensor Alarm - 2 Sets
$15.99
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Universal Dusk-to-Dawn Photo Cell Switch - Perfect for Versatile Lighting Needs
$21.99
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SALE 4pcs Zigbee Window Door Sensors Smart Contact Sensors For App Home Assistant
$24.59$25.88
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Water Leak Detector 4 with 105dB Audio Alarm, Freeze Warning, App Push, Email Al
$24.14
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KERUI Driveway Alarm Wireless System Outdoor Motion Sensor for Home Security USA
$36.99
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Motion Detector Alarm PIR Infrared Anti-Theft Burglar Welcome Chime Doorbell USA
$15.99
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Wireless Alarm Receiver with Rechargeable Battery & Customizable Alerts
$42.99
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SALE Hands-Free Motion Activated Switch for Indoor Lighting
$21.59$26.99
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Automatic Water Leak Detector with Sensors and Shut-off Valve
$78.60
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Aqara Zigbee Motion Sensor P1, Smart Detector, Requires AQARA White
$35.37
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Aqara Presence Sensor FP2, mmWave Radar Wired Smart Motion Sensor, Zone White
$121.72
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Motion Detector Alarm PIR Infrared Anti-Theft Burglar Welcome Chime Doorbell USA
$16.99
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SALE Motion Sensor DC 5V 24V Light Switch Movement Detector Automatic PIR Sen D
$9.85$11.32
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Compact Motion Sensor for Home Security – Free and Monitoring Plans
$22.99
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SALE Water Leakage Sensor Flood Leak Liquid Detector Probe Alarm Home Fa-cx
$3.93$4.14
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Battery 2000mAh Type 377040 2412-3012 PA000570 for Roto RT2 SF G1 RT1 DS1000
$83.64
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Smart Water Leak Detector 1804ft Range, WiFi Sensor with Alarm & Alerts, 2 Pack
$71.99
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Industrial Semi Large, Oil Rubbed Bronze (Includes $12 bulb, 2700K, 800LM)
$60.99
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AC 85-265V New Motion Infrared Sensor Switch For Outdoor 180° Detection Range
$13.29
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5V-24V PIR Infrared Ray Motion Sensor Switch USB/DC LED Detector Switching n
$11.99
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Wireless Mailbox Alarm Sensor - Long Range Delivery Alert System with SBS50 Base
$63.99
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1/2 Mile Long Range Wireless Driveway Alarm- Outdoor/Indoor Motion Sensor&Detect
$82.60
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GE Cync Smart Motion Sensor - Wire Free - White
$12.00
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Solar Motion Sensor Siren 4 Modes 129dB With 13 Alarm Sounds For Warehouse
$26.99
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New ABS Water Leak Alarm Flood Level Overflow Detector Sensor Home Security
$11.19
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AC100-240V Infrared Sensor Switch Adjustable Delay Time for Lighting Control
$13.29
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Solar Motion Sensor Alarm Animal Repeller With Strobe Light 129dB Siren 4 Modes
$22.99
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5-24V USB Port Detector Infrared PIR Motion Sensor Switch For Led Light Strip dd
$11.27
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Smart LCD Thermometer Hygrometer Wi-Fi Temperature Humidity Sensor Monitor
$20.11
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Sunco LED Shop Lights for Workshop 4FT, Linkable Garage 1 Pack, 6000K White
$41.99
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