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Under $20 Security System Sensors

Shop the best prices on 2,775 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 2,775
Garage Door Bracket for Ring Alarm Contact Sensors 2nd Gen (Sensor Not Included), Garage Door Securi
$10.95 Save $6.00 RRP: $16.95
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
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
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
1/4 Inch Ring Alarm Magnet Riser,5 Pack Mount to Any Doorway, Window, and Entryway,Ring Sensor/Magnet Not Included unbrand
$16.95
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
Magnetic Door Switch RC-33 NC Recessed Wired Security Window Door Sensor Alarm White- (10 Sets)
$10.95 Save $33.00 RRP: $43.95
Tuya WIFI Smart Door Window Magnetic Sensor Security Alarm Open Closed Detector Home for Anti-Theft Door Rolling Door
$18.95
Door Window Magnetic Contact Wired Sensor Detector Switch for Home Garage Alarm Security
$21.95 Save $18.00 RRP: $39.95
TUYA WiFi Door and Window Sensor Smart Security Alarms for Alexa Google Home
$18.95 Save $2.00 RRP: $20.95
TUYA WiFi Door and Window Sensor Smart Security Alarms for Alexa Google Home
$18.95 Save $2.00 RRP: $20.95
Door Magnetic Sensor Wireless Window Open Detector Electronic AntiTheft Burglary Device
$17.95 Save $41.05 RRP: $59.00
Tuya ZigBee Door Window Sensor Anti-Theft Alarm Smart Home Wireless Detector APP Remote Work with H
$14.95 Save $4.00 RRP: $18.95
C100 125dB Vibration Sensor Alarm Door and Window Alarm Home Personal Anti-theft Alarm(Black)
$20.95
Wireless Door Window Burglar Sensor 4 Modes Alarm Door Open Detectors Freezers Close Reminder Security Protection White
$8.95 Save $2.00 RRP: $10.95
Garage Door Bracket for Contact Sensors 2nd Gen
$10.95 Save $6.00 RRP: $16.95
Doberman Se-0701 Oval Household Anti-theft Door And Window Magnetic Spring Sensor Super Loud Simple Alarm unbrand
$14.95 Save $8.00 RRP: $22.95
Retroreflective Grating Large Photoelectric Beam Sensors Reflector Square 5Pcs
$19.95 Save $19.00 RRP: $38.95
Wall Mounted Remote Control Holder Organizer with Adhesive, Sturdy Storage Box for Easy Access Without Drilling
$13.95 Save $14.00 RRP: $27.95
TUYA WIFI Temperature Sensor APP Remote Monitor Tuya Waterproof Temperature Sensor 2.4G WiFi Smart
$19.95
5 Mini White Recessed Door Contacts NC Security Alarm Sensors for Windows and Doors with Magnetic Reed Switch Compatibility
$21.95 Save $9.00 RRP: $30.95
DOBERMAN SE-0701 Oval Household Anti-theft Door and Window Magnetic Spring Sensor Super Loud Simple Alarm
$16.95
2pcs Wired Pir Motion Sensor Wide Angle Passive Infrared Detector For Home Burglar Security Alarm Sy
$17.95 Save $13.00 RRP: $30.95
Tuya Zigbee Door Window Sensors Wireless Smart Life Magnetic
$12.95 Save $6.00 RRP: $18.95
Tuya Zigbee Smart Home Wireless Door and Window Contact Door Sensor APP Control
$14.95 Save $44.05 RRP: $59.00
Door Magnetic Alarm Wireless Door and Window Anti-Theft Alarm Home Anti-Theft Door Opening Sensor 10
$18.95 Save $10.00 RRP: $28.95
100V 10W Zinc Alloy Magnetic Reed Switch NC Door Window Contact Sensor for Garage Warehouse Shop in Europe
$19.95 Save $59.05 RRP: $79.00
Tuya Zigbee Smart Vibration Sensor Tilt Detector Home Security Protection Smart Life App Real-Time Monitor Alarm
$15.95 Save $9.00 RRP: $24.95
DC12V Infrared Photocell Beam Sensor Automatic Gate Door Garage Shutter Barrier Detector for Door W
$14.95 Save $69.05 RRP: $84.00
Magnetic Door Window Contact Sensor Alarm Reed Switch Security Burglar Alarm
$17.95 Save $15.00 RRP: $32.95