RYOBI TEK4 RP4300 Motion Sensor/Alarm ** GREAT CONDITION ** Bare Tool
$39.99
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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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SALE Motion Sensors APP Remote Control Occupancy Sensors Ceiling Mount Motion Sensors
$16.24$20.30
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Automatic Water Leak Detector with Sensors and Shut-off Valve
$78.59
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Feit Smart Home Audible Alarm Wireless Smart-Enabled White Security Alarm
$19.99
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Flume 2 F2100 Smart Home Water Monitor Leak Detector WiFi Water Usage Sensor
$75.00
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4 Mode Solar Alarm With Motion Sensor 129dB Red Blue Lights For Garden Security
$26.99
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1Pc Home Water Leak Alarm Flood Level Overflow Detector Sensor Security Alert
$11.19
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Thermometer Hygrometer Wi-Fi Temperature Humidity Sensor Monitor ℃/℉ switch
$21.39
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SALE Waterproof Driveway Alarm with Flash Warning - Red, 2 Pack
$58.39$72.99
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Motion Sensor DC 5V 24V Light Switch Movement Detector Automatic PIR Sen J
$10.99
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Automatic Light Sensor Control Switch DC8-50V Photocell Light Switch Replacement
$13.39
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129dB Outdoor Solar Alarm With Motion Sensor 4 Modes Dog Barking Gunshot Sounds
$26.99
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AC 85-265V Motion Infrared Sensor Switch For LED Lights 180° Detection Range
$13.29
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Smart Thermometer Hygrometer Wi-Fi Temperature Humidity Sensor Home Improvement
$21.39
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Motion Sensor DC 5V 24V Light Switch Movement Detector Automatic PIR Sen H
$10.99
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Infrared Motion Sensor Home Garage Alert Security System DIY Your Home
$20.59
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1Pc USB Port Detector Infrared PIR Motion Sensor Switch For Led Light Strip kk
$11.99
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Universal USB Port Detector PIR Motion Sensor Switch For Led Light Strip aa
$11.99
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20m Anti-Theft Alarm Infrared Detector Sensor Photoelectric Home Security System
$16.39
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U.S. Patrol Set of 2 Lamp Sensors Fits Standard Sockets Home Security
$4.00
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1/2 Mile Wireless Driveway Alarm - Weather Resistant Sensor & Plug-in Receiver
$87.99
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SALE Solar Outdoor Motion Sensor Alarm-129db Loud Siren Lamp Noise Maker, 4 Workin...
$36.09$37.99
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2GIG-PIR1-345 Wireless Passive Infrared Motion Sensor NEW
$39.77
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SALE Bunker Hill Security Driveway Alert System Wireless Intruder Alarm (BRAND NEW)
$17.50$28.99
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Mr Beams MB3000 500 Lumen Wireless Motion Sensor LED Lights 2PK
$59.99
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BANVIE Keyless Entry Alarm System + Remote Starter + Push Button
$78.99
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Low Voltage Ceiling Sensor Pir Occupancy Motion Detector, 360° Field of View, 12
$46.55
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Long Range Driveway Alarm - 1 Mile Wireless Motion Detector System
$115.99
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Honeywell RF6CT Door/Window Sensor for ADT Alarm System
$15.00
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SALE Solar Wireless Driveway Alarm System- 1/2 Mile Long Transmission Range- 300 F...
$191.99$239.99
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SALE Solar Wireless Driveway Alarm System 1/2 Mile Range, 1 Receiver & 4 Solar Sen...
$217.59$271.99
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Wireless Signal Detector 6 Levels Sensitivity Intelligent Rechargeable Port UWDQ
$16.27
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Resideo FG-1615T FlexGuard Glassbreak Detector New Open Box Honeywell Alarm
$49.00
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SALE GE Indoor Security Audible Window/Door Alarms 2-Pack Sensor NEW
$18.00$20.00
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DSC BV-500GB - Ceiling Mount Pir Glasbrk C&t 1 Top Broken 1 Good Condition
$50.00
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TECKNET Indoor Motion Sensor Alarm 125dB Loud Wireless Remote Control Security
$45.05
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Water Pipe Leakage Monitor ‑70Ddb Sensitivity 20000X Sound Amplification Re WJPT
$41.55
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Sabre Home Series Home Security Kit Personal Alarm HS-New
$14.99
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Wireless Driveway Alarm,Home Security Alarm,Pir Motion Sensor Alert System
$40.99
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Wireless Window and Door Sensor for Net Connected Home Security Alarm & Home Aut
$26.82
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Outdoor PIR DC 12V Automatic Infrared PIR Motion Sensor Switch for LED Flood Lig
$17.36
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5Pcs Recessed Wired Security Window Gate Contact Sensor Alarm Magnetic Reed Swit
$19.32
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ADC-S2000-T-RB Temperature Sensor ALARM.COM Wireless Smart New
$34.99
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DMP 1106-W Wireless Universal Transmitter White Security Alarm Sensor 1106W
$35.00
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NICECNC Sensor Protection Plate Sensor Shield Sensor Guard Compatible with BMW R
$79.99
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DMP Model 1122 Wireless Security Alarm PIR Motion Passive Infrared, New Open-box
$45.00
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SALE Lot Of 2 - SimpliSafe Home Security Entry Sensor ES3
$17.99$22.97
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Smart Motion Sensor for Hue Lights - Wireless, Easy Setup, Requires Hue Bridge
$77.99
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