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 120 db alarm. 110 degree wide angle.
eBay
DC/AC 12-24V sensor alarm infrared beam sensor photocell waterproof IP55 Swing /Sliding/Garage Gate Safety Infrared Photocells
Aliexpress UK
Yale Wireless Shed And Garage Alarm - White - SAA5015. It is simple to install, can be wall-mounted or be freestanding. The Yale Shed and Garage Alarm is standalone wire free and battery operated alarm so there is no need to run any cables.
eBay
Motion Sensor Alarm with Remote Control, Indoor Wireless Infrared Security Motion Detector with Siren (125dB)
Aliexpress UK
Wireless, infrared motion detection. If motion is detected, the alarm waits 5 seconds before sounding, allowing authorized users to disarm it via remote. 105 dB loud alarm to deter intruders. 1 × Motion Sensor Alarm.
eBay
KERUI 120db WIFI Speaker Horn Home Siren Alarm Kit Burglar Security System with Infrared Motion Detector Door Sensor Siren Kit
Aliexpress UK
This is a pair of infrared detector. Install them at the opposite positions. Then there is a infrared area between these two detector parts. Small and beautiful appearance for infrared beam detector.
eBay
IP55 Automated Gate Safe Infrared Beam Sensor Photocell For Garage Door Opener фотоэлемент для ворот Detector Anti-theft Alarm
Aliexpress UK
WIRED PIR FOR HARDWIRED BURGLAR ALARM SYSTEMS COMPATIBLE WITH ANY UK WIRED BURGLAR ALARM SCANTRONIC TEXECOM PYRONIX ETC LAST 2 PHOTOS SHOW AN EXAMPLE FITTED ON A WALL SO YOU CAN ENVISAGE WHAT IT’LL LOOK LIKE ONCE INSTALLED IN YOUR PROPERTY. THESE ARE NEW OLD STOCK FROM SOME YEARS AGO SO EXPECT A FEW FAINT MARKS ETC HENCE THE CHEAP PRICE THEY COME INDIVIDUALLY BOXED WITH A MANUAL BUT NO FIXINGS.
eBay
Alarm sound:≤ 120dB (within 10cm). IP65 ultra-high waterproof grade ensures that the motion detector is not attacked by rain. Solar Security Sounds Lights Doors Windows Motion Sensor Alarm Infrared Detector.
eBay
Alarm sound:≤ 120dB (within 10cm). IP65 ultra-high waterproof grade ensures that the motion detector is not attacked by rain. Solar Security Sounds Lights Doors Windows Motion Sensor Alarm Infrared Detector.
eBay
Solar Outdoor Infrared Powered Driveway Alarm Anti-Theft Induction Wireless Outdoor Alarm For Fish Pond Orchard. Infrared sensing, accurate detection. Conical fan-shaped infrared detection, long distance, high accuracy.
eBay