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Under $20 Security System Sensors

Shop the best prices on 3,632 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 3,200
12V 3A Power Supply Adapter Universal Power Adapter Transformer for Monitor
$18.95 Save $6.00 RRP: $24.95
TUYA Zigbee Temperature Sensor APP Remote Monitor Tuya Waterproof Temperature Sensor Smart Home 2M
$19.95 Save $9.00 RRP: $28.95
TV Simulator with AC Adaptor Anti-Burglar and Theft Deterrent Home Security Timer and Sensor,EU Pl
$16.95 Save $47.05 RRP: $64.00
E3F-20C1 3mm Laser Beam Photoelectric Switch Trough-beam Infrared Sensors NPN Switchs with LED
$14.95 Save $10.00 RRP: $24.95
TUYA WIFI Temperature Sensor APP Remote Monitor Tuya Waterproof Temperature Sensor 2.4G WiFi Smart Home 1M
$17.95 Save $8.00 RRP: $25.95
2X Tuya ZigBee Devices Button Scene Switch Intelligent Linkage Smart Switch Battery Powered Work with Smart Life
$16.95
TUYA Zigbee Temperature Sensor APP Remote Monitor Tuya Waterproof Temperature Sensor Smart Home 2M
$20.95 Save $5.00 RRP: $25.95
Magnetic Door Switch RC-33 NC Recessed Wired Sensor Alarm (10 Sets)
$11.95
Garage Door Magnetic Curtain Door Sensor with 5m Wired Magnetic Detector for Garage Door Opener Accessories
$8.95 Save $5.00 RRP: $13.95
Tuya Zigbee Illuminance Sensor IP67 Waterproof Light Sensor Brightness Detection Real Time App Control Sensor
$17.95
Tuya Smart Vibration Sensor ZigBee Tuya Sensor Monitor App Control Security Protection Zigbee Senso
$17.95
Power outage alarm for garage 220v with loud sound Lianshi P20211224875
$8.95 Save $1.00 RRP: $9.95
Masteelf 1 Set Door Open Sensor Magnetic Security Sensor Window Alarm for Elderly Safety
$18.95 Save $12.00 RRP: $30.95
Door Window Sensors Detector Home Security Magnetic Sensor Door Window Anti-theft Alarm Surface Mount Strong Concealment
$14.95
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 $20.00 RRP: $30.95
Magnetic Door Window Contact Sensor Alarm Wired-Security Home Burglars Alarm NO/NC Magnetic Switchs Easy to Install
$19.95 Save $2.00 RRP: $21.95
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 $18.00 RRP: $38.95
Infrared Beam Sensor For Gates, Doors Window - External Alarm Detector
$7.95
Tuya Zigbee Vibration Sensor Smart Home Vibrator Door Window Break Burglar Detector Smart Life App Security Protection
$18.95
Infrared/IR Beam Detector Sensor for Perimeter Protection Outdoor Security System
$21.95 Save $6.00 RRP: $27.95
Home Window Door Burglar Security Alarm System Magnetic Sensor
$18.95 Save $6.00 RRP: $24.95
Magnetic Clothing Hard Tag Remove Security Detacher
$8.95 Save $4.00 RRP: $12.95
Wifi PIR Motion Detector Intelligent Infrared Alarm Sensor Anti Theft 110° Wide Angle Detection for Tuya
$20.95 Save $38.05 RRP: $59.00
Infrared Beam Detector Burglar Ir Alarms Sensor Alarm System (PrettyJ)
$11.95 Save $5.00 RRP: $16.95
Zigbee Temperature and Humidity Sensor Mini Temperature Humidity Detector with for App Control
$16.95 Save $5.00 RRP: $21.95
RC-33 NC Recessed Wired Security Window Door Contact Sensor Alarm Magnetic Recessed Switch White - (6 Sets)
$11.95 Save $4.00 RRP: $15.95
RC-33 NC Recessed Wired Security Window Door Contact Sensor Alarm Magnetic Recessed Switch White - (6 Sets)
$11.95
Tuya WiFi Smart Door Magnetic Sensor App Control USB Wireless Door & Window Sensor Door Magnetic Alarm Detector
$17.95 Save $6.00 RRP: $23.95
Zigbee Smart Vibration Sensor,Real Time Monitoring,Door Window Vibration Detection Siren for Home,App Remote Control
$21.95 Save $6.00 RRP: $27.95
Ultra-slim Round Door / Window Alert Detect Vibration Sensor Alarm for Home Alarms Security
$20.95
Magnetic Door Window Contact Sensor Alarm Wireds Metal Security Home Burglars Alarm NO NC Magnetic Switches Easy Install
$11.95 Save $52.05 RRP: $64.00