4x Door & Window Entry Alarm Set. They also have a simple on/off switch, an instant alarm of 105 decibels. with double sided adhesive mounting pads.
eBay
Tuya WiFi or ZigBee Door Window Sensor Smart Home Wireless Door Open Close Detector APP Remote Alarm Work with Alexa Google Home
Aliexpress UK
The Guardline Wireless Driveway Alarm system consists of wireless connectivity and includes an alarm to alert you whenever someone enters your driveway. This home security system provides peace of mind for homeowners looking to enhance their security measures. With easy installation and reliable performance, the Guardline Wireless Driveway Alarm system is a practical choice for those looking to deter unwanted guests or vehicles from their property.
eBay
Aqara P1 Door Window Sensor Zigbee 3.0 Smart Home Wireless Anti-theft Homekit Induction Door Magnetic Alarm For HomeKit APP
Aliexpress UK
The VOXON Wireless Door and Window Alarm Sensor 2 Pack in white features a magnetic sensor for detecting when doors and windows are opened or closed. With a noise level of 100 dB, this battery-powered sensor is easy to install using the included double-sided adhesive. Compatible with windows, this wireless sensor is an essential component for home security systems, providing peace of mind against unwanted intruders. The VOXON brand ensures quality and reliability in protecting your home.
eBay
Tuya WiFi/ZigBee Door Window Sensor Smart Home Wireless Door Open Close Detectors APP Remote Alarm Work with Alexa Google Home
Aliexpress UK
1/2/4/5/8/10PCS Window Door Burglar Security Alarm. This product is easy to install, only need to paste the main and auxiliary parts on the cover and the chassis, or two windows, and align (leave about 5 mm gap).
eBay
Tuya WiFi/ZigBee Door Window Sensor Smart Home Wireless Door Open Close Detectors APP Remote Alarm Work with Alexa Google Home
Aliexpress UK
LOW BATTERY CONSUMPTION - The alarm system's low battery consumption ensures a long life for the alarm. 90 DECIBLE - The security alarm is super powerful because it has a range of 90 decibels. So you can hear the alarm everywhere.
eBay
1/2/3pcs Doors and Windows Alarm Home Safety Anti-theft Wireless Door Magnetic Sensor Volume Refrigerator Window Open Reminder
Aliexpress UK
Manufacturer Sanjie. Included Components 1 Receiver(UK Plug-in), 1 Sensor (battery included), Screws, Adhesive tape, Product manual. Noise level 120 Decibels. Size 1 Sensor+1 Receiver. Maximum range 800 Feet.
eBay
Tuya WiFi/ZigBee Door Window Sensor Smart Home Wireless Door Open Close Detectors APP Remote Alarm Work with Alexa Google Home
Aliexpress UK
3 Wireless PIR Motion Detector with 9V Battery. The host supports up to 30pcs wireless detectors, 8pcs remote key fobs, 4 doorbell buttons. 2 Wireless Remote Key Fobs with 23A 12V Battery. 2 Wireless Door Sensors with 23A 12V Battery.
eBay
Aqara Door Window Sensor P1 Smart Home Wireless Anti-theft Homekit Induction Door Magnetic Alarm Zigbee 3.0 Aqara Home Devices
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
1/3/6pcs Wireless 433MHz Magnetic Door Sensor Door Window Two-way Open / Close Detector for Home Security Alarm Systems
Aliexpress UK