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Under $20 Home Alarm Systems

Shop the best prices on 5,368 great value under $20 home alarm systems. Shopping for home alarm systems is easy with Fruugo, with SALE discounts, offers and savings on Elsavct, GreenZech, Nedis and more. Buy home alarm systems online safely with Fruugo, with secure payment and fast shipping to Singapore.

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1 - 32 of 5,368
3 Pack Perimeter Trip Alarm, 12 Gauge Camping Trip Wire Device,Early Warning Security System for Camping/Bear Deterrent
$21.95 Save $11.00 RRP: $32.95
Perimeter Trip Alarm, Trip Alarm 12 Gauge Camping Trip Wire Alarm Device, Bear Deterrent,Camping Safety Trip Alarm A
$6.95 Save $14.00 RRP: $20.95
HS09 Wireless Bluetooth-Compatible Temperature Humidity Sensor Smart Digital Thermometer Hygrometer
$19.95 Save $10.00 RRP: $29.95
Safety Alarm for Women by WomenLoud Siren Bird Sound,Strobe Light & KeyChain--Pink
$20.95 Save $3.00 RRP: $23.95
Personal Safety Alarm Rechargeable Alarm with LED Light, Compact Keychain Design, Compatible with Bags, Keys, Backpacks
$2.95 Save $1.00 RRP: $3.95
Voice Control Anti Lost Device Whistle Key Finder Keychain Locator Tracer (Red)
$13.95 Save $4.00 RRP: $17.95
2 Pack Door Stop Alarms, 120db Loud Portable Wedge Entry Alert Security Tools For Home Security House Apartment Hotel Travel
$15.95 Save $23.00 RRP: $38.95
Fridge Alarm Freezer Alarm with Adjustable Voice Reminders Close Door Reminder Voice Alert
$15.95 Save $5.00 RRP: $20.95
Perimeter Trip Wire Alarm with 12 Gauge & .22 Adapter - Outdoor Camping Early Warning Security System for Property Protection
$17.95 Save $71.05 RRP: $89.00
Passage alarm/store bell Wireless system with motion/access detector 38 ringtones Up to 100 m range
$17.95 Save $30.00 RRP: $47.95
Passage Alarm, Shop Bell, Wireless Alarm System With Motion Detector -ACGIV
$11.95 Save $10.00 RRP: $21.95
Infrared Beam Detector for Burglar Alarm, Wireless Security Sensor System
$14.95 Save $9.00 RRP: $23.95
AC 220V Mini Alarm Speaker Active Piezo-Electronic Buzzer Waterproof Beep Tone Alarm for Home, School, Hospital Multicolor
$17.95
AC 10-28V to DC 12V Buck Converter AC DC Step Down Power Supply Module (3A)
$19.95 Save $5.00 RRP: $24.95
Camping Security Alarm Kit with 12 Gauge Wire Components for Perimeter Protection
$19.95 Save $23.00 RRP: $42.95
Passage Alarm, Shop Bell, Wireless Alarm System With Motion Detector -ACGIV Edition 0808
$19.95 Save $32.00 RRP: $51.95
2pcs Ultrasonic Car Deer Animal Alert Warning Whistles Safety Sound Alarm Black Shytmv
$6.95 Save $12.00 RRP: $18.95
Wired Mini Siren for Home Security Alarm System Horn Siren 120dB 12V YY
$20.95
Home Mini 12v Horn Siren 110 Db With 3.5mm Plug (red) 1 Pieces
$17.95
Door Window Alarm, Door Alarms for Kids Safety, Window Pool Alarms for Home, Anti-Theft/Doorbell/ C
$14.95 Save $1.00 RRP: $15.95
26-27 Alarm 220v Powerful Exterior, Sirene Alarm 120db, Red Motor Conduit Sirne Mtal Horn Industry Boat Alarm Ruikalucky
$14.95 Save $15.00 RRP: $29.95
Perimeter Trip Alarm, Trip Alarm 12 Gauge Camping Trip Wire Alarm Device, Bear Deterrent,Camping Tr
$14.95 Save $69.05 RRP: $84.00
Infrared Beam Detector Burglar Ir Alarms Sensor Alarm System
$20.95 Save $21.00 RRP: $41.95
Wired Mini Siren for Home Security Alarm System Horn Siren 120dB 12V
$8.95
120dB Home Security Wedge Door Stop Alarm System Device Intruder P2Z1
$15.95 Save $7.00 RRP: $22.95
2025 New 3-pack Safety Wedge Door Stop Alarm Stopper Blocking Travel Home Security Alert
$12.95 Save $46.05 RRP: $59.00
Portable Travel Door Alarm Entry Defense Intruder Alarm 91db Flashlight For Home Office Apartment H
$12.95 Save $8.00 RRP: $20.95
Dual Modes Self Defense Personal Alarm for Women, 135 dB Siren LED, USB Rechargeable Security Alarm
$19.95 Save $11.00 RRP: $30.95
Perimeter Travel Alarm, 12-Gauge Camping Travel Cord Alarm Device, Camping Safety/Bear Deterrent Warning Security System
$13.95 Save $6.00 RRP: $19.95
12V Wired Strobe alarm siren alarm security alarm system 115db
$14.95 Save $69.05 RRP: $84.00
5pcs Recessed Magnetic Window Door Contacts Alarm Security Reed Switch
$14.95 Save $69.05 RRP: $84.00
2X Personal Alarm Self Alarm 125DB Personal Defenses Siren for Child Women Security Portable Alarm K
$15.95 Save $8.00 RRP: $23.95