SALE 20m Single Beam Alarm Photoelectric Infrared Detector Alarm Home Security
$10.65$11.33
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
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.
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 
SALE 3-5m Automatic Body Infrared PIR Motion Sensor Detector Switch For LED light
$5.04$5.37
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 1pc Automatic PIR Occupancy Motion Sensor Light Switch Auto On/Off Infrared
$10.55$11.22
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE High Sensibility Microwave Body Induction Module Radar Induction Switch Sensor
$6.45$6.87
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 1 PC Waterproof Solar 6LED Flashing Red Light Motion Sensor Security Alarm Lamp
$17.26$18.36
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE PIR Infrared Motion Sensor Detector Auto Switch AC 110V-240V Light Lamp On/Off
$5.30$5.63
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 15s Sensor Switch Infrared Human Body Sensing Switch cabinet Sensing
$6.45$6.87
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 2pcs PIR Motion Sensor Switch Wall Light Switch For Power Consumption: <0.5W
$11.50$12.24
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Motion Detector Switch AC100-240V High Quality Replacement for Light Control
$8.05$8.56
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Govee wifi Water leak sensor detector system + gateway 3 pack New
$28.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Resideo FG-1625: Heavy Duty FlexGuard Glass Break Detector White
$30.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
NC NO Contact Switch Door Sensor Wired Metal Roller Shutter Door Home A
$9.97
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
HydroCheck Water Sensor Alarm, Smart Water Leak Detector for Home & Basements...
$130.03
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
APEC WATER WiFi Water Leak Detector for Home, App Connected get RealTime Aler...
$50.80
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Safety Alarm for Door Window 3 Sensitivity Setting Instantly Loud 120dB Alerts
$15.74
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Wireless Mailbox Alarm Sensor - Long Range Delivery Alert System with Base Stati
$59.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
2 Set Solar Outdoor Alarm Motion Sensor 13 Sounds Including Dog Barking& Guns...
$61.08
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Motion Sensor Alarm Outdoor,Motion Sensor Alarm,13 Sound,Dog Barking&Gu...
$44.51
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Outdoor Motion Detector Sensor Alarm, Personalize Recording Siren & Str...
$39.33
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Outdoor Motion Sensor Alarm - Dog Barking & Gunshot Sound, Support Reco...
$39.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Outdoor Motion Sensor Alarm with Dog Barking Gunshot Sound, Support Rec...
$76.15
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm R
$13.50
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Driveway Alarm Wireless Outside 1800ft Range, Outdoor Motion Sensor & D...
$159.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Outdoor Motion Sensor Alarm 4 Working Mode Motion Activated Alarm 129dB...
$53.56
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Outdoor Motion Sensor Alarm-Dog Barking&Gunshot Sound, 130db Motion Det...
$145.45
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Outdoor Motion Sensor Alarm with Dog Barking Gunshot Sound, Support Rec...
$116.84
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Sound & Light Alarm Outdoor Motion Sensor 129db Siren Sound Alert & 6LE...
$95.74
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Motion Sensor Alarm Outdoor,Dog Barking/Gunshoot,with Remote Control,Su...
$39.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Motion Sensor Alarm Outdoor 4 Working Mode Motion Activated Alarm 129dB...
$53.55
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
1/2 Mile Long Range Wireless Driveway Alarm Outdoor Weather Resistant Motion ...
$129.64
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Outdoor Motion Sensor Alarm - Infrared, Dog Barking&Gunshot Sound Alarm...
$35.31
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE OC-55 NO+NC Alarm Security Contact Magnetic Reed Switch for Rolling Gate Garage
$17.91$21.07
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Water Leak Alarm Flood Level Overflow Detector Sensor Home Security Alert LOT
$8.81$9.68
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
AC 85-265V Durable Motion Infrared Sensor Switch For Outdoor 180° Detection
$12.23
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Motion Sensor DC 5V 24V Light Switch Movement Detector Automatic PIR Sen C
$10.11
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
HTZSAFE Driveway Alarm - 1/2 Mile Wireless Motion Sensor & Detector
$78.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
5-24V USB Port Detector Infrared PIR Motion Sensor Switch For Led Light Strip ff
$11.03
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
2pcs 180° PIR Motion Sensor Switch infrared wall mount switch 50/60Hz 110-240V
$13.79
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Motion Sensor DC 5V 24V Light Switch Movement Detector Automatic PIR Sen G
$12.90
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
3-5m Automatic Body Infrared PIR Motion Sensor Detector Switch For LED light G
$11.71
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
$15.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
New 10 x RC-33 NC Recessed Door Contact Sensor Alarm Magnet Reed Switch
$12.78
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
New Low-Cost Water Leak Alarm Flood Level Overflow Detector Sensor Security
$11.08
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
White PIR Motion Sensor Wall Switch AC100-240V for Downlights & Ceiling Lights
$13.16
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Wifi Water Leak Detector for Home with App Notification, 1 Gateway + 6 WD61 Sens
$49.50$55.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Wyze Home Security System Core Kit with Hub, Keypad, Motion, 2 Entry Sensors
$69.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
DC 10 x RC-33 NC Wired Door Contact Sensor Alarm Magnet Reed Switch
$14.98
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
20m Single Beam Alarm Photoelectric Infrared Detector Alarm Home Security C
$17.48
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.