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Under $20 Security System Sensors

Shop the best prices on 2,814 great value under $20 security system sensors. Shopping for security system sensors is easy with Fruugo, with SALE discounts, offers and savings on Ydcy, GreenZech, Other and more. Buy security system sensors online safely with Fruugo, with secure payment and fast shipping to Singapore.

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1 - 32 of 2,814
10pcs Magnetic Reed Switch Door Window Security Alarm System Normally NC NO Contact Switches for Enhanced Home Safety B
$16.95 Save $9.00 RRP: $25.95
Garage Door Bracket for Ring Alarm Contact Sensors 2nd Gen (Sensor Not Included), Garage Door Securi
$10.95 Save $6.00 RRP: $16.95
1/4 Inch Ring Alarm Magnet Riser,5 Pack Mount to Any Doorway, Window, and Entryway,Ring Sensor/Magnet Not Included unbrand
$15.95
3pcs 433MHz Wireless Vibration Glass Break Detector, Adjustable Sensitivity, Compatible with Alarm Systems Black
$18.95 Save $10.00 RRP: $28.95
Zigbee Smart Door Window Sensor Wireless Mini Alarm Sensor for Mi Home
$13.95 Save $39.00 RRP: $52.95
TUYA WIFI Temperature Sensor APP Remote Monitor Tuya Waterproof Temperature Sensor 2.4G WiFi Smart Home 1M
$17.95 Save $7.00 RRP: $24.95
Tuya WiFi Light Sensor Smart Home Illumination Sensor APP Linkage Control Brightness Detector Illumi
$19.95 Save $6.00 RRP: $25.95
New Tuya ZigBee Smart Vibration Sensor Real Time Monitoring Door Window Detection Alarm Smart Security Protection System
$10.95 Save $7.00 RRP: $17.95
2 Sets Magnetic Door Switch Wired NC NO Normally Open Closed Door Contact Switch for Home Security 1
$21.95 Save $7.00 RRP: $28.95
Smart Door Window Sensor 2.4G WiFi Magnetic Open Close Detector Home Burglar Alarm for TUYA
$13.95 Save $13.00 RRP: $26.95
Door Alarm Sensor White High Decibel Wireless Security Door Window Alarm Sensor Burglar Alarm
$14.95
LJC18A3 B z BX Capacitive Proximity Sensor Switch DC12~24V 10mm-10% NPN
$20.95 Save $25.00 RRP: $45.95
Zigbee Smart Vibration Sensor,Real Time Monitoring,Door Window Vibration Detection Siren for Home,App Remote Control
$15.95 Save $48.05 RRP: $64.00
Magnetic Door Switch RC-33 NC Recessed Wired Security Window Door Sensor Alarm White- (10 Sets)
$14.95 Save $69.05 RRP: $84.00
Wireless Home Doors Windows Security Entry Alarm System Pack 6
$18.95 Save $40.05 RRP: $59.00
Touch Sensor Door Handle Alarm Anti Theft Vibration Window Burglar Alert Home Security Door Alarm A
$16.95
10W Magnetic Reed Switch Zinc Alloy Responsive NC Door Window Contact Sensor for Garage Warehouse Shop 100V f74
$17.95 Save $76.05 RRP: $94.00
Smoovie Multifunctional Infrared Detector Camera Scanner Anti-theft Anti-sneak Shot Pir Sensor Lig
$16.95 Save $57.05 RRP: $74.00
Tuya WiFi Smart Door Window Sensor Home Indoor Door Magnetic Detector Compatible with Alexa & Google Home White unbrand
$12.95
Smart Door And Window Sensor Work With Google Home Alexa Smart Home Wifi Window Sensor
$21.95 Save $37.05 RRP: $59.00
BERM Proximity Switch Cylindrical Shaped 3‑Wire NO Detection Sensor PRL18‑5DN 10‑30VDC
$22.95 Save $26.00 RRP: $48.95
1 Pair Automated Gate Safe Infrared Detector Sensor/ Swing /Sliding/Garage Gate / Door Safety Infrared Photocells
$19.95 Save $9.00 RRP: $28.95
Zigbee Temperature and Humidity Sensor Mini Temperature Humidity Detector with for EWelink App Control unbrand
$12.95
Garage Door Magnetic Curtain Door Sensor with 5m Wired Magnetic Detector for Garage Door Opener Accessories unbrand
$9.95
Tuya ZigBee Smart Door and Window Sensor Burglar Magnetic Sensor with Scene Interaction Button APP Remote Control
$20.95 Save $10.00 RRP: $30.95
10pcs Magnetic Reed Switch Door Window Security Alarm System Normally NC NO Contact Switches for Enhanced Home Safety A unbrand
$19.95
WiFi Smart Zigbee Temperature and Humidity Sensor LCD Screen History Record Smart Home Security Remote Control unbrand
$19.95
1/4 Inch Ring Alarm Magnet Riser,5 Pack Mount to Any Doorway, Window, and Entryway,Ring Sensor/Magnet Not Included unbrand
$16.95
Smart WiFi Vibration Sensor Alarm Wireless Vibration Detector Alert Real-Time Activity & Shock Detection Black unbrand
$16.95
Tuya Door Magnetic Alarm, Anti-Theft Alarm, WIFI APP Door Magnetic Opening Reminder Remote Alarm unbrand
$13.95
Zigbee Smart Door Window Sensor Wireless Mini Alarm Sensor for Mi Home
$18.95 Save $15.00 RRP: $33.95
Zigbee Door Sensor for Home Security with Instant Alerts and Seamless Smart Hub Integration
$20.95 Save $11.00 RRP: $31.95