SALE Submersible Level Gauge with Display Sensor Water Level Gauge SS Probe Water Tan
$203.02$213.71
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 
1PCS New DS426i-CHI Dual Beam Photoelectric Detector
$349.90
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
AC110V-220V PIR Infrared Body Motion Sensor Detector Control Lamp Auto Switch
$5.62
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
HPE Flood-Control flood and temperature sensor NICE FGFS-101 ZW5 EU
$66.85
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
HPE Wykrywacz dymu i temperature Nice NICE FGSD-002 ZW5 EU
$72.61
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
2gig DW10E Wireless Thin Door & Window Sensor
$17.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Smart Wi-Fi Glass Break Sensor with Audible Alarm, Wireless, 24/7 Home Security
$54.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Personal Security Window and Door Alarm, 4 Pack, DIY Protection, Burglar Alert,
$37.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Intelligent Technology Z-Wave Pet Immunity Motion Detector with Pet Immunity, Wh
$60.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Sensorswitch Ceiling Motion Sensor, PDT Passive Dual Technology Passive Infrared
$91.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Safety Technology International, Inc. -9621 Motion Detector Damage Stopper Steel
$44.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
FM231 Wireless Driveway Alarm – Electromagnetic Vehicle Detection, Indoor Receiv
$132.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Twist-To-Lock Motion Sensor, Easy to Install Daylight and Motion Detector for Li
$58.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
5 Pack Water Leak Detectors for Home, 100Db Water Sensor Alarm for Basement,Floo
$56.95
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Eve Motion (Matter) Smart Motion Sensor - 1 Pack - White
$30.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
AC100-240V Infrared Sensor Switch Adjustable Delay Time for Lighting Control
$12.36
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
$10.41
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
$12.92
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Acuity Sensor Switch CM PDT 10 *184CGY Large Extended 360 dual Lighting Controls
$49.80
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
$15.24
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 H
$10.22
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 H
$10.22
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
1Pc USB Port Detector Infrared PIR Motion Sensor Switch For Led Light Strip kk
$11.15
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Touchless Wireless Door Opener Sensor Switch with WiFi, Alexa & Google Assistant
$409.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
12 Pack Wireless Window & Door Alarms - Easy DIY Home Security System
$83.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Wireless Motion Sensor Alarm for Elderly - Health Alert System with Pressure Pad
$266.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Motion Detector Switch AC100-240V High Quality Replacement for Light Control
$12.36
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE New Bunker Hill Wireless Security Driveway Alert System 400ft Range NIP
$11.99$12.74
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
$19.15
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
High Sensitivity 24.125GHz Human Inductive Motion Microwave Radar Sensor
$19.52
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
5V-24V PIR Infrared Ray Motion Sensor Switch USB/DC LED Detector Switching j
$11.15
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
5V-24V Automatic PIR Body infrared LED Strips Light Motion Sensor Switch
$10.22
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
1Pc USB Port Detector Infrared PIR Motion Sensor Switch For Led Light Strip aa
$11.15
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
$15.24
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Honeywell SiXCT Two-Way Wireless Door / Window Sensor (Used)
$10.00$14.93
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Wi-Fi Water Leak Sensor Starter Kit, 2-Units, 100 Db Alarm Siren and App Alert,
$364.95
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
HPE Wykrywacz tlenku wgla Nice CO-Control CO CO Alarm-Control 868.4MHz
$89.92
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
HPE Czyjnik Ruchu Nice Motion-Control FGMS-001 ZW5 EU NICE FGMS-001 ZW5 EU
$57.62
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Versa GE-Compatible Wireless Security Sensor 2540 ( Lot Of 10)
$100.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
GE Cync Smart Motion Sensor Wire Free
$14.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Water Level Alert with Text Message and Email Notifications, Battery Powered ...
$93.92$110.49
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 110 dB Water Alarm w/Detachable Sensor for Hard-to- Areas BWD-HWA
$22.52$26.49
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
WATER PUMP PULLEY FAN BLADE CLUTCH EXPANSION TANK SENSOR CAP KIT for BMW E39
$13.47
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
INKECI USB Powered Mini Spotlights for Displays 2-Pack – 5V 2PACK Warm Light
$18.56
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Water Level Alarm for Fish Tanks Ensures Stable Water Level Conditions
$13.58$14.60
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Squareglow Smart Flasher WI-FI Enabled Visual Alert System Wireless ,Expandable
$75.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
UprizeP RGB LED Ceiling Light, with Bluetooth Speaker, 24W 11.5 inch, White
$46.15
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 110-240V AC Adjustable 360° Ceiling PIR Body Motion Sensor Detector Lam
$11.73$12.35
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.