Built in PIR motion sensor. The motion detector power by 4 AA batteries (not included). When the alarm is triggered,it will sound for 20 seconds. Loud 105 db alarm. 110 degree wide angle.
eBay
TAIBOAN 433MHz Wireless Doorbell Home Music Door Bell Alarm Volume Adjustable Compatible With WiFi GSM Alarm System EU/US Plug
Aliexpress UK
It has a long battery and good transmission strength to cope with brick walls. The PIR sensor has been designed and optimised for performance and battery lifespan so users are not having to frequently change batteries - Motion sensor has a built in low battery indicator.
eBay
Door and Window Alarm Security Wireless Home Window Door Anti-theft Security Alarm System Magnetic Sensor
Aliexpress UK
Keep your Properties safe with our alarm system, designed for quick and easy installation. Simply attach the fixing plate to your Properties ply lining or bulkhead. You can also add an optional vibration or impact sensor to detect external threats for enhanced security.
eBay
Mini Wireless Alarm Door Stop Alarm 120dB Great for Home Wedge Shaped Stopper Alert Security System Block Blocking System
Aliexpress UK
1) 17-chord music chip and 40mm loud speaker for pleasant and louder alerts Remote transmission range up to 280m/ 918ft in open space. 2) 4 independent LEDs to distinguish sensing zones, with the option to synchronize sound alerts 3) 5 stages adjustable volume from 113 ~ 25dB. 4) Infrared + microwave radar composite dual detection for lower false alarm rates 5)Added silent and vibration reminder.More privacy,no disturbance ,vibration reminder for discreet alerts 6)Expandable.The receiver can learn from up to 32 wireless sensors like PIR motion, magnetic or vibration sensor as well as up to 8 remote controllers. 7) Low battery indication. Both the sensor and receiver can be powered by battery or plugged into a USB interface. 8) IP66 Waterproof ideal for outdoor use.
eBay
WiFi or Zigbee Water Leak Sensor Tuya Alarm Flood Leak Detector Smart Home Life APP Water Alert Overflow Alarm Security System
Aliexpress UK
Wireless PIR Motion Sensor Detector with Remote Control Security Alarm System Motion Sensor Alarm for Home Garage Alarm Alert Security Indoor Features: 1.Passive infrared sensor is an electronic sensor that can measure infrared (IR) light emitted by an object in its field of view. They are most commonly used in pirg-based motion detectors. 2.This motion sensor alarm is ideal to protect your property from unwelcome intruders. It can cover front doors, back doors, garages, sheds, outbuildings, etc., and can also be used for caravans and RVs. .
eBay
WiFi/Zigbee Water Sensor Tuya Leakage Alarm Flood Leak Detector Smart Home Life APP Water Alert Overflow Alarm Security System
Aliexpress UK
Ideal for use in entryways, garages, sheds, or any area needing extra security. Wireless, infrared motion detection. 105 dB loud alarm to deter intruders. If motion is detected, the alarm waits 5 seconds before sounding, allowing authorized users to disarm it via remote.
eBay
Door Window Wireless Burglar Alarm with Magnetic Sensor Alarm 108dB High Volume Door Open Detectors Home Security Device
Aliexpress UK
1 Pcs PIR Transmitter. 2️⃣Press “M ” key --> 🔔 Doorbell Mode --> Press “🎵 ” key --> Choose a ringtone (36 ringtones). For indoor use only. 3️⃣Press “M ” key --> 🔒 Alarm Mode --> Press “🎵 ” key --> Choose an alarm sound.
eBay
WiFi or Zigbee Tuya Leakage Water Sensor Alarm Flood Leak Detector Smart Home Life Water Alert Overflow Alarm Security System
Aliexpress UK
The host supports up to 30pcs wireless detectors, 8pcs remote key fobs, 4 doorbell buttons.
eBay
KERUI Wireless 433MHz D025 Window Door Sensor Magnet Detector For W181 W184 W204 Home Security Alarm System Burglar An-theft
Aliexpress UK