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Under $20 Security System Sensors

Shop the best prices on 2,349 great value under $20 security system sensors. Shopping for security system sensors is easy with Fruugo, with SALE discounts, offers and savings on Ydcy, Dirtypigs, Other and more. Buy security system sensors online safely with Fruugo, with secure payment and fast shipping to Australia.

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1 - 32 of 2,349
10pcs Magnetic Reed Switch Door Window Security Alarm System Normally NC NO Contact Switches for Enhanced Home Safety B
$19.95 Save $10.00 RRP: $29.95
Garage Door Bracket for Ring Alarm Contact Sensors 2nd Gen (Sensor Not Included), Garage Door Securi
$11.95 Save $8.00 RRP: $19.95
1/4 Inch Ring Alarm Magnet Riser,5 Pack Mount to Any Doorway, Window, and Entryway,Ring Sensor/Magne
$17.95
Zigbee Smart Door Window Sensor Wireless Mini Alarm Sensor for Mi Home
$15.95 Save $48.05 RRP: $64.00
1/4 Inch Ring Alarm Magnet Riser,5 Pack Mount to Any Doorway, Window, and Entryway,Ring Sensor/Magnet Not Included unbrand
$18.95
Tuya Zigbee 3.0 Smart Contact Detectors Security Gate Door Window Sensor ducer Smart Life Home
$12.95 Save $2.00 RRP: $14.95
TUYA WIFI Temperature Sensor APP Remote Monitor Tuya Waterproof Temperature Sensor 2.4G WiFi Smart Home 1M
$20.95 Save $9.00 RRP: $29.95
New Tuya ZigBee Smart Vibration Sensor Real Time Monitoring Door Window Detection Alarm Smart Security Protection System
$12.95 Save $8.00 RRP: $20.95
BERM Inductive Proximity Switch Sensor 4mm Induction Distance 3‑Wire DC10‑30V SN04‑P2
$18.95 Save $22.00 RRP: $40.95
Tuya Door Magnetic Alarm, Anti-Theft Alarm, WIFI APP Door Magnetic Opening Reminder Remote Alarm unbrand
$15.95
Smart WiFi Vibration Sensor Alarm Wireless Vibration Detector Alert Real-Time Activity & Shock Detection Black unbrand
$18.95
Photocell Infrared Sensor Detector for Automatic Gate Obstacle Detector Anti-Theft Alarm System unbrand
$19.95
Garage Door Magnetic Curtain Door Sensor with 5m Wired Magnetic Detector for Garage Door Opener Accessories unbrand
$11.95
Door Open Alarm Smart Door Window Sensor Smart Home Door Detectors Door and Window Burglar Alarms unbrand
$14.95
1/4 Inch Ring Alarm Magnet Riser,5 Pack Mount to Any Doorway, Window, and Entryway,Ring Sensor/Magnet Not Included unbrand
$19.95
Zigbee Temperature and Humidity Sensor Mini Temperature Humidity Detector with for EWelink App Control unbrand
$15.95
Security Tag Remover for Garment Alarm Buckles Hard Magnet Detacher Tool Compatible with EAS System
$20.95 Save $43.05 RRP: $64.00
Active Infrared Beam Sensor for Gate Openers, Anti-Theft Access Control Security Alarm System
$15.95 Save $32.00 RRP: $47.95
Tuya ZigBee Devices Button Scene Switch Intelligent Linkage Smart Switch Battery Powered Automation Work with Smart Life
$15.95 Save $8.00 RRP: $23.95
Tuya WiFi Smart Door Sensor Wireless Magnetic Door Window Open Closed Detectors 26s
$15.95 Save $16.00 RRP: $31.95
Freezer Door Alarm When Left Open, Safety Window Alarm, 3/15/30/60 Seconds Adjustable Delay Wireless Fridge Alarm, 4-in-1 Door Sensor Chime Door Open
$17.95 Save $22.00 RRP: $39.95
Freezer Door Alarm When Left Open, Safety Window Alarm, 3/15/30/60 Seconds Adjustable Delay Wireless Fridge Alarm, 4-in-1 Door Sensor Chime Door Open
$6.95 Save $39.00 RRP: $45.95
Door Sensor Alarms Home Security Anti Theft Burglar Door Window Entry Open Sensor Alarms for Home Apartment
$19.95 Save $15.00 RRP: $34.95
Tuya ZigBee Smart Vibration Sensor Real Time Monitoring Door Window Detection Alarm Smart Security Protection Sensor
$20.95
Magnetic Door Switch RC-33 NC Recessed Wired Sensor Alarm (10 Sets)
$19.95
Tuya Zigbee Door Window Sensors Wireless Smart Life Magnetic
$19.95
Magnetic Clothing Hard Tag Remove Security Detacher - Easy and Efficient Solution
$14.95 Save $15.00 RRP: $29.95
Magnetic Door Window Contact Sensor Alarm Reed Switch Security Burglar Alarm
$20.95 Save $21.00 RRP: $41.95
Door Sensor Alarms Home Security Anti Theft Burglar Door Window Entry Open Sensor Alarms for Home Apartment
$17.95 Save $10.00 RRP: $27.95
120dB Touch Sensor Door Handle Alarm Anti Theft Vibration Window Burglar Alert Home Security
$20.95 Save $11.00 RRP: $31.95
433MHz Door Magnetic Contact Wireless Sensor Detector Switch for Home Garage Alarm Security
$20.95 Save $12.00 RRP: $32.95
Wireless Vibration Alarm 120dB Alarm Sound Safe Prevent Theft Door Window Alarm Sensor for Home
$19.95 Save $11.00 RRP: $30.95