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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
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 Light Sensor Smart Home Illumination Sensor APP Linkage Control Brightness Detector Illumi
$19.95 Save $6.00 RRP: $25.95
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
1/4 Inch Ring Alarm Magnet Riser,5 Pack Mount to Any Doorway, Window, and Entryway,Ring Sensor/Magnet Not Included unbrand
$16.95
Refrigerator And Freezer Alarm, Door Left Open, Reminders At 60 Seconds Or More-2025
$17.95 Save $20.00 RRP: $37.95
Refrigerator And Freezer Alarm, Door Left Open, Reminders At 60 Seconds Or More-2025
$17.95 Save $15.00 RRP: $32.95
2 Pack White Burglar Alarm Door Window Sensor Wired Anti-theft Contact Detectors Waterproof Professional Quality For Kids Children Safety Diy Protecti
$16.95 Save $87.05 RRP: $104.00
Wireless White Door Alarm Sensor High Decibel Security Burglar Alert
$11.95 Save $7.00 RRP: $18.95
Door Alarm Sensor 120db Loud Wireless Door Alarm Hanging Contact Sensor Black Alarm
$12.95 Save $7.00 RRP: $19.95
2025 Latest Model Door Open Detection Alarm Door & Window Sensor Simple Use Door
$18.95 Save $12.00 RRP: $30.95
Garage Door Bracket for Ring Alarms Contact Sensors(2nd Gen), Easy-to-Install Garage Door Safety Accessory
$10.95
Tuya Wifi Smart Door Sensor Window Entry Sensor with Scene Interaction Button Smart Life for APP Remote Control
$20.95 Save $12.00 RRP: $32.95
TUYA WIFI Temperature Sensor APP Remote Monitor Tuya Waterproof Temperature Sensor 2.4G WiFi Smart Home 1M
$18.95 Save $12.00 RRP: $30.95
Tuya ZigBee 3.0 Window Door Gate Sensor Detector Controlled Via Smart Life App for Alexa Google Home White
$19.95 Save $12.00 RRP: $31.95
Emergency Panic Wireless SOS Emergency Button Alarm
$13.95 Save $8.00 RRP: $21.95
PVC D Profile Window Door Seal, 6M Strong Adhesive Weatherproof Noise Insulation Strip for Doors & Windows (Black)
$16.95 Save $9.00 RRP: $25.95
Magnetic Switch Alarm Sensor for Overhead Garage Door with L Bracket
$19.95 Save $34.05 RRP: $54.00
Magnetic Remover Clothing Hard Tag Remove/security Tag Detacher Tw-dwdz
$12.95 Save $7.00 RRP: $19.95
Infrared Beam Detector 2pcs Automatic Burglar Alarm Sensor
$12.95 Save $38.00 RRP: $50.95
Magnetic Door Window Contact Sensor Alarm Reed Switch Security Burglar Alarm f54
$13.95 Save $70.05 RRP: $84.00
Magnetic Door Window Contact Sensor Alarm Reed Switch Security Burglar Alarm
$14.95 Save $32.00 RRP: $46.95
1 Pair Home Security Single Beam Infrared Detector Anti-theft Counterfire Alarm Infrared Sensor
$20.95 Save $33.05 RRP: $54.00
Tuya ZigBee Smart Vibration Sensor Real Time Monitoring Door Window Detection Alarm Smart Security
$19.95 Save $3.00 RRP: $22.95
Magnetic Remover Clothing Hard Tag Remove/security Tag Detacher
$19.95 Save $20.00 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
$19.95 Save $20.00 RRP: $39.95
Burglar Alarm for Doors and Window 120dB High Decibel Salarm Sensor
$9.95
Magnetic Door Switch RC-33 NC Recessed Wired Sensor Alarm (10 Sets)
$20.95 Save $1.00 RRP: $21.95
Zigbee Temperature Humidity Sensor Work with
$20.95 Save $1.00 RRP: $21.95