D-Link Water Sensor Pod Add-On (DCH-S163) Battery-Powered Long-Range
$39.80
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Sensors & Motion Detectors
Motion, door/window and glass-break sensors are the trip-wires of a security system. Check what hub or panel they pair with (many are brand-specific and won't mix), wired vs wireless, and battery life for wireless units. For motion sensors, pet-immune designs avoid false alarms. Buying spare or used sensors is fine — just confirm the protocol and that they're compatible with your system.
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Panasonic KX-HNS102 Wireless Home Network Motion Sensor - New in Box
$16.95
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Home WiFi Smart Temperature Humidity Sensor Meter Hygrometer Thermometer Monitor
$19.27$21.18
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Maestro Motion Sensor Light Switch Indoor Bathroom Garage
$44.99$49.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Ring Alarm Motion Detector - 2nd Gen - White - New Authentic
$29.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 30cm 5V-24V PIR Infrared Ray Motion Sensor Switch USB/DC LED Detector Switching
$10.80$11.87
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Peco Se200-002 Occupancy Sensor, Window Switch, White, -
$6.79
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE Sensorswitch Cmrb 10 Fixture Mount Sensor, Occupancy, Photocell, 0 To 10V
$113.99$126.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
4 Modes Outdoor Solar Alarm 129dB Motion Sensor With Dog Barking Gunshot Sounds
$25.10
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Wireless driveway and intruder alert Kit, includes a weatherproof motion sensor
$29.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Interlogix tx-e221 wireless sensor
$35.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Aqara Water Leak Sensor 2 Pack New Zigbee Wireless Water Leak Detector for Alarm
$39.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Single Pole Occupancy Motion Sensor Light Switch, PIR Infrared Motion Activated
$55.77
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Ring Motion Sensor Wireless Indoor Z-Wave Alexa Motion Detector, White
$20.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
(6x) SimpliSafe Original Generation (ES1000) Door/Window Entry Sensor
$29.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
$61.82
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Wireless Vibration Alarm - 110dB Anti-Theft Security for Bikes, Cars & Homes
$23.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SimpliSafe Original Generation Extra Panic Button (PB1000) - BRAND NEW
$14.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Motion Sensor Alarm Indoor: Wireless Motion Detector Alarm with Siren & Strobe (
$32.95
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Ring Alarm Range Extender 1st Gen And Motion Detector
$15.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
New 10 x RC-33 NC Wired Door Contact Sensor Alarm Magnet Reed Switch 100V
$13.06
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
ABS Water Leak Alarm Flood Level Overflow Detector Sensor Home Security
$10.52
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
AC 85-265V Maintenance Motion Infrared Sensor Switch For Outdoor 180° Detection
$12.49
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Ring Motion Detector Newest Model
$68.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Ring Motion Sensor for Outdoor Smart Lights
$42.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
WATT STOPPER HB-4D CONTROL MODULE UNMP
$44.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
WiFi Water Level Monitor Alarm Float Sensor Battery
$154.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
125dB Loud Motion Sensor Alarm with 328ft Remote Control (40ft PIR Detector, ...
$40.65
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Maxsa 37313-RS Park Right Dual Laser Parking Guide Garage Open Box
$19.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
260581 Matter Smart Door and Window Sensor, Thread Contact Sensor Home Security
$22.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
4 Pack EVA LOGIK Glass Break Alarm Ultra-Thin WINDOW ALARM Loud 120dB Alarm
$28.90
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Corporation THP108 PowerBACK! Mains Return Alarm
$77.43
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Anker - Eufy Security Entry Sensor NEW
$44.89
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
hepside 1PACK Flush Mount LED Ceiling Light Fixture 6.5Inch-1pack, White
$14.76
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
FOITTON Black Flush Mount Ceiling Light, 12 Inch 2-Light 12 inch, Black8
$52.88
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE New 315mhz Infrared Motion Sensor Home Garage Alert Security System
$18.55$20.38
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 433MHz Wireless Pet-Immune PIR Detector For HOMSECUR 4G WIFI Alarm System
$22.85$25.39
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE INSTEON Smarthome Open/Close Sensor MODEL 2843-222 Door Sensor New in Box
$28.45$29.95
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE AC 85-265V Durable Motion Infrared Sensor Switch For Outdoor 180° Detection
$11.98$13.16
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
SALE 3pcs Wireless Pet Friendly (15KG) Motion Sensor For 433MHz Home Alarm System
$53.19$57.19
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Advanced Solar Motion Sensor Alarm with USB Backup & Strobe Light—500 Ft Range
$53.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Infrared Beam Detector Professional Anti-Jamming IR Sensor For Perimeter Protect
$15.45
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
UltraPro Personal Security Window and Door Alarm, 4 Pack, DIY Protection, Burgla
$43.85
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Water Leak Detection Device - High Sensitivity Pipe Leak Monitor with Earphones
$57.99
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
MYFOX HOME ALARM INTELLITAG VIBRATION AND OPENING SENSOR
$9.95
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Driveway Alarm- 1/2 Mile Long Range Wireless Driveway Alarm Outdoor Weather Resi
$78.96
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
$50.00
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.
Wireless Driveway Alarm Weatherproof Motion Detector Security System 1/2 Mile
$138.98
View on eBay
Affiliate link — we may earn a commission, at no extra cost to you. Read our affiliate disclosure.