Idea for roller shutter door. Zinc alloy housing, sliver grey. Detecting door gap by opening. Be used to detect door if it is opened or moved.
eBay
KERUI W184 4G WIFI GSM Alarm System Unit Wireless Home Tuya Smart APP Control Motion Sensor Burglar Support Alexa Motion Sensor
Aliexpress UK
Use it to monitor any area inside or outside, it's wireless so you can place it anywhere in the house or even take it from room to room. Wireless Plug-in Receiver: The portable wireless plug-in receiver plugs into any standard outlet.
eBay
Aqara IP67 Water Immersing Sensor Zigbee Flood Water Leak Detector Alarm Security Soaking Sensor Work With Mi Home Homekit APP
Aliexpress UK
Easy to switch both on and off by the flick of a switch. Simply peel off the backing strip on the mounting pad and apply where desired on both doors and windows. Simple to install, simple to operate and assured peace of mind.
eBay
Aqara Water Leak Sensor ZigBee Water Immersing Detector Alarm Security Soaking Sensor Smart Home For Xiaomi Mi Home Homekit APP
Aliexpress UK
The Door Alarm Sensor is the perfect solution for enhancing your home security. This door alarm is designed to detect any unauthorized entry or door opening, acting as a reliable deterrent against potential intruders.SpecificationMaterial: ABSSound Intensity: 125dBPower Source: LR44*3 (included)Installation Distance: <10mmAlarm Host Size: 75mm x 39mm x 12mm/ 2.95" x 1.54" x 0.47" (L*W*H)Magnetic Strip Size: 32mm x 11.5mm x 10mm/ 1.26" x 0.45" x 0.39" (L*W*H)Packing List: 1 x Door Window AlarmAdvantageFeaturing a loud 125dB a-lert sound, this door alarm ensures that any rare activity is immediately detected and brings attention to the situation. With its high decibel output, it not only a-lerts those inside the house but also acts as a deterrent to scare off intruders.
eBay
32 Songs Wireless Doorbell Welcome Door Bell Chime Remote Transmission Smart Home One Click Emergency Security Alarm US EU Plug
Aliexpress UK
Loud 110dB siren for maximum security. High-sensitivity touch sensor for accurate detection. Ideal for improving safety and peace of mind.
eBay
TUYA WIFI video intercom doorbell system for home apartment 7" wireless smart video doorphone RFID SD Card motion detect alarm
Aliexpress UK
[Easy to Install and Work] Our alarm is battery operated (requires 3 AAA batteries, not included), no wiring required, just hang the alarm on the inside of the door handle. 1x Door Handle Alarm.
eBay
Wireless Doorbell Elderly Pager Emergency Button Paramedic Pager Full Alert Alarm Patient Senior Care Home Door Bell EU US Plug
Aliexpress UK
High safety performance. Once a thief pries a door, window, or attempts to steal, the alarm can emit a strong sound to scare off the thief. Align the arrow of the auxiliary unit with the mark on the side of the main unit.
eBay
120db Wireless Door Stop Stopper Alarm Block Blocking System Door Blocking Device Home Travel Mini Anti-theft Wedge Shaped
Aliexpress UK
🇬🇧ELPINE Wireless Window Door Burglar Security Alarm 105dB System. 105 DB Instant Alarm. Operated by 3 pcs 1.5v LR44 button cell batteries (included). Easily mounted by adhesive tape to window or door.
eBay
KERUI M521 Wireless Doorbell Outdoor Smart Home Security Welcome Chime Kit 57 Songs Door Bell Alarm LED Light Waterproof Button
Aliexpress UK