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Under $20 Security System Sensors

Shop the best prices on 2,776 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 2,776
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 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
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
WiFi Door Sensor Real Time Alarm Sensitive Smart Door Sensor for Home Office Hotel
$20.95 Save $10.00 RRP: $30.95
Tuya Smart Vibration Sensor ZigBee Tuya Sensor Monitor App Control Security Protection Zigbee Senso
$17.95
1/10pcs Zigbee 3.0 Wifi Tuya Temperature Humidity Sensor Smart Home Thermometer Hygrometer Detector With
$18.95
PB-69W WIFI Smart Wireless Magnetic Door and Window Sensor
$19.95
433mhz Door Magnetic Contact Wireless Sensor Detector Switch For Home Garage Alarm Security - White (battery Not Included) - 1 Piece
$10.95 Save $21.00 RRP: $31.95
20pcs Hard Drive Mounting Screws Kit with Shock Absorption Washers for HDDs – Easy Installation and Stable Fixation for Secure Setup
$13.95 Save $6.00 RRP: $19.95
Automatic Toilet Flush Button Smart Flusher ExternalInfrared Sensor
$17.95
Zigbee Smart Vibration Sensor,Real Time Monitoring,App Remote Control
$16.95 Save $4.00 RRP: $20.95
2 Sets Magnetic Door Wired NC NO Normally Open Closed Door Contact Switch for Home Security 100V DC
$11.95 Save $11.00 RRP: $22.95
Door and Window Alarm, Wireless Door and Window Detectors with Remote Control and Batteries, Anti-Intrusion Anti-Theft Magnetic Sensor for Home and Ki
$20.95 Save $19.00 RRP: $39.95
Magnetic Clothing Hard Tag Remove Security Detacher
$8.95 Save $4.00 RRP: $12.95
Tuya Matter Thread Door Window Sensor Usb Powered Smart Home Wireless Detector Work With Alexa Home
$20.95
Tuya ZigBee Smart Vibration Sensor Real Time Monitoring Window Alarm
$16.95 Save $7.00 RRP: $23.95
Wifi PIR Motion Detector Intelligent Infrared Alarm Sensor Anti Theft 110° Wide Angle Detection for Tuya
$21.95 Save $42.05 RRP: $64.00
Security Burglar Alarm: Magnetic Door Window Contact Sensor Reed Switch
$19.95 Save $44.05 RRP: $64.00
Smart WiFi Vibration Sensor Alarm Wireless Vibration Detector Alert Real-Time Activity & Shock Detection White unbrand
$15.95
Tuya Wifi Smart Door Sensor Window Entry Sensor with Scene Interaction Button Smart Life for APP Re
$22.95
Ultra-slim Round Door / Window Alert Detect Vibration Sensor Alarm for Home Alarms Security
$20.95
Tuya Wireless Smart Door Window Sensor Alarm Remote Control Operation Burglar Alarm For Home Door W
$9.95
DOBERMAN SE-0701 Oval Household Anti-theft Door and Window Magnetic Spring Sensor Super Loud Simple Alarm
$16.95
Ultrasonic Ranging Alarm Kits LED Display Design of Reverse Alarm DIY Kit Ultrasonic Sensor Module
$16.95 Save $7.00 RRP: $23.95
Smart Wifi Temperature and Humidity Sensor for Home Iot Device
$15.95 Save $68.05 RRP: $84.00
Door Opening Sensor Wireless Time Delay Door Alarm Door Sensor Door and Window Security Alarm Home Security
$15.95
2Pcs Infrared Beam Detector, 20m Waterproof Security Sensor for Door/Window Burglar Alarm System SZRH
$19.95 Save $32.00 RRP: $51.95