Design House Jelly Jar Ceiling Light, 4.83 inches Diameter, Oil-Rubbed Bronze
$30.99
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.
ESDS Water Leak Detector with Shutoff Valve,Sensors and Sounds Alarm,Automati...
$158.84
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
U.S. Solid Water Leak Detector with Auto ShutOff Valve & Sound Alarm, 1" NSF ...
$166.47
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 110/220v Sensitive Infrared Light Motion Sensor Automatic Sensor Light Swi R A3
$4.17$5.20
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
JONATHAN Y 8.5" Black/Gold 1-Light Modern 8.5 in, Painting
$48.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Honeywell Dual Tec Motion Sensor DT-6360STC Motion Sensor
$155.87
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
DEVMO 27370-38000 Ignition Failure misfire Sensor Compatible with Santa Fe
$28.54
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 1PC Panasonic EX-F72 Leak Detection Sensor New Free Shipping
$147.39$173.40
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE X10 EagleEye Motion Sensor (Outdoor) MS14A
$13.59$16.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Nitrogen Oxide Sensor Compatible with Cummins NOx Sensor 5WK9 6693A 2894946RX
$231.30
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Box of 10 Vivint Recessed Hidden Door Window Sensor VS-DW2100-345 Security Alarm
$200.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Smart LCD Thermometer Hygrometer Wi-Fi Temperature Humidity Sensor Monitor
$19.68
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Infrared Motion Sensor Switch 140° Detection Angle AC100-240V for Public Places
$12.23
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Effective Device Water Leak Alarm Flood Level Overflow Detector Security
$10.29
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 E
$10.11
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 E
$10.11
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Toddler Monitor Smart Door Child Motion DECCO in box with power cord
$24.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
NEW Qolsys QS1137-840 Window Door Sensor
$18.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
GE Jasco Indoor Security Audible Window/Door Alarms 2-Pack Window Sensor NEW
$17.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
LOT OF 2 SimpliSafe GEN 3 Motion Sensor Detector Security System BRAND NEW NIB
$45.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
16 2GIG DW20R-345 Recessed Door Window Contact Sensor /NEW/JUA3801
$160.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Optex Passive Infrared Detector EX-35T 35ftx55ft
$20.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
2 GIG - DW30-345 Outdoor Wireless Contact Sensor/JUA3802
$40.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
AC Infinity Hydro Sensor Water Quality Meter, Wired Indoor, Black/Gold
$99.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
HONEYWELL Aurora Pet Immune PIR Motion Sensor 35'x45' Coverage New Sealed! ⭐️
$14.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Crestron C2N-RTHS Relative Temperature and Humidity Sensor
$115.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Ademco 998 PI PIR Motion Detector Pet Immune 40 lbs
$20.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Bosch ISC-BPR2-WP12 Blue Line Gen2 Pet-Friendly PIR Motion Detector 40ftx40ft
$20.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Honeywell DT-6360STC DUAL TEC Motion Sensor
$174.70
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SimpliSafe Entry Door/Window Sensor (ES1000) - Gen 1 - Lot Of 3
$27.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Heath Zenith 180-Degree Motion Security Light in Bronze SL-5412-BZ-A
$44.95
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE NEW Battery-Operated Water Alarm Sump Accessory Detect Leaks Loud 110db Alarm
$12.99$15.17
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
4PCS New TPMS Sensor for Mercedes-Benz 2018 2019 2020 2021 2022 2023 2024 2025
$145.73
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Aqara FP2 Presence Sensor mmWave HomeKit HomeAssistant Smart Home + 2Tapo Switch
$42.55
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Wireless Anti Spy RF Detector Hidden Camera GPS Finder
$29.58$36.98
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Rechargeable Motion Sensor Light with Remote,7.5inch 600LM 2 PACK, White
$44.29
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
$8.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Zigbee PIR Motion Sensor 120° Wireless Passive Infrared Detector Home Security a
$19.38$20.61
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 5V-24V Automatic PIR Body infrared LED Strips Light Motion Sensor Switch
$6.13$6.52
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Automatic Infrared PIR Motion Sensor Body Induction Switch Control Accessories
$9.95$10.58
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE AC 85-265V Motion Infrared Sensor Switch For Exhaust Fan 180° Detection Range
$10.84$11.54
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Solar Motion Sensor Alarm 4 Modes 129dB With Red Blue Strobe Lights For Outdoor
$24.74$26.32
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Single Beam Alarm Photoelectric Detector Security System Garage Door
$15.48
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Strobe Light Motion Detector Alarm: Dog Barking and Gunshot Sound, 13 K...
$33.93
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Outdoor Motion Sensor Alarm, Barking Dog Alarm with 360° Detection, Supports ...
$55.05
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Solar Wireless Driveway Alarm with 2600FT Long Range & 36 Melodies & 5 Volume...
$60.36
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 - 360° Detection & 3x120dB Speakers, 3 Sens...
$55.05
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Norlake 145858 Sensor, NTC, 10K Ohm, 5' Long
$37.20
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.