WIFI Door Window Sensor 4pcs Wireless Magnetic Alarm For Tuya App V1
$38.44
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 Seco-Larm E-931-S50RRGQ Reflective Photoelectric Beam Sensor, up to 50Ft Sensing
$85.83$98.65
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Lutron Maestro Motion Switch – 2-Pack, White, Occupancy/Vacancy, Single Pole
$52.66
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Outdoor Solar Motion Detector Alarm 129dB 4 Working Modes For Warehouse Garage
$26.86
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
2pcs PIR Motion Sensor Switch For Ambient Light: 2LUX~2000LUX (Adjustable)
$12.62
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Automatic Light Sensor Control Switch DC8-50V Photocell Light Switch Repair Part
$8.69
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
New Infrared Motion Sensor Home Garage Alert Security System DIY Your Home
$18.93
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
New ABS Water Leak Alarm Flood Level Overflow Detector Sensor Home Security
$6.31
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Simplisafe 1st Generation Alarm System Glass Break Sensor Read
$10.49$14.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
DC4-12V PIR Motion Detection Sensor Light Switch Infrared Human Body Induction
$5.18
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
D-Link SW-A11KT Water Leak Detector Kit 2 Sensors
$250.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
3 Packs 12 V 24 V PIR Sensor Adjustable LED c Black Infrared Motion Detector ...
$20.72
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Maestro Motion Sensor Light Switch - Automatic On/Off
$37.49$49.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
QOLSYS iQ2+ With DSC 433, Power G, Alarm.Com Verizon LTE Cell, & Power Supply
$125.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
NEW NIB ADT Home Security Starter Kit Full Set with Sign and Decals F-ADT-HUB-1
$94.88
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
AJAX DoorProtecPlus MAGNETIC BREAK CONTACT (9NA) Jeweller Withe/Black
$64.95
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Smart Life Tuya WiFi ZigBee Human Presence Sensor MmWave Radar Light Sensor Home
$34.83
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
GoveeLife Human Presence Sensor, 2.4 GHz Wi-Fi Required, Smart mmWave Radar & PI
$49.88
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Vtg Hard Plastic Chicken 8" Sensor Activates Crowing ROOSTER Batteries included
$13.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
$36.81
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Annaror 12in Motion Sensor Ceiling Light Wired, 3000K 4000K 12 Inch White
$38.81
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SimpliSafe Home Security System Panic Button Model PB3 White - NEW Gen3
$15.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE AC180-240V 50/60Hz Auto On/Off Light Voice Sound Sensor Switch Time Delay F
$2.96$3.15
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE IPEVO CSW2-02IP SENSOR FOR WHITEBOARD W/adapter
$18.79$19.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Water Leak Detector Set with 100dB Alarm for Basements Bathrooms
$25.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
New 100 MA 10 x RC-33 Wired Door Contact Sensor Alarm Magnet Reed Switch
$9.60
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Body Infrared PIR Motion Sensor Switch For LED Light Strip Automatic DC 12V F
$8.41
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Waterproof LED Solar Alarm Warning Light Sensor Lamp Alert Remote Control F
$13.67
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 I
$5.46
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 I
$6.66
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Adjustable Power Restoration Alarm with LED - Compatible with All Generators
$46.79$51.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
LaCrosse Technology Water Detector TX60U-IT & H20 Sensor
$79.95
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Motion Sensor, 180-Degree Replacement Motion Detector, Adjustable Time & Detecti
$28.95
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
High / Low Water Level Sensor Detector Alarm 120 dB Red Strobe Siren, Adjusta...
$28.75
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Water Level Alert with Text Message and Email Notifications, Battery Powered ...
$96.15
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Aqara Motion Sensor P1 5 Year Battery Hub Required Smart Home
$19.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
KERUI Wireless Driveway Alarm Doorbell IR Motion Sensor Outdoor Home Security
$38.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Genuine SwitchBot WiFi Water Leak Sensor Smart Detector Open Box
$15.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Driveway Alarm- 1/2 Mile Long Range Wireless Driveway Alarm Outdoor Weather Resi
$83.77
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
WKONCLDY 7.5Inch LED Ceiling Lights, 5 Colors Selectable 7.5in-8Pack, Black
$79.50
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
MLC4BC Plug-In Motion Activated Control
$40.77
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Tuya Smart ZigBee Temperature Hygrometer Sensor Automation Voice Control Alexa
$18.15
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
X10 Model MS10A Security Motion Sensor Wireless Tehnology
$12.50
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Sentrol ShatterPoint Residential Acoustic & Seismic Glassbreak Sensor 5620-W
$37.49$49.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Sanjie Door Window Alarm 3 Pack 125dB Magnetic Wireless Home Security
$12.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Smart Water Leak Detector 3 Pack - WiFi Sensor with 1804ft Range, Alarm & Alerts
$109.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Cordless Portable Fan Compatible with Milwaukee M18 18V Battery Camping Fan P...
$62.18
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
DSC WS4904 Wireless PIR Indoor Motion Detector Sensor, White
$28.50
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.