I use these in a multifamily apartment building to detect when doors get propped open by tenants. I use them in the time delay setting and they do the trick.
Wsdcam Wireless Door Alarm With Remote 2 Pack, Battery Included, 105 DB Loud Pool Door Alarm, Wireless Door Open Alarms Sensor For Kids Safety Home Security
54 Review
UHPPOTE Fire Control Expansion Panel Board For Access Controller With Enhanced Alarm Output
13 Review
Enhance Your CCTV Security With BlueFishCam'S Waterproof Wide Angle Lens Camera
29 Review
AUNA Areal Active 525-5.1 Surround Sound System Home Theater Bluetooth USB SD AUX Black
13 Review
Germany France Travel Power Adapter,TESSAN Schuko Plug With 2 USB Ports 2 AC Outlets, US To European Europe German French Spain Iceland Norway Russia Korea Adaptor(Type E/F)
17 Review
HOMELYLIFE 600W High Power Voltage Reducer DC 48V 60V 72V Step Down To DC 12V 50A Buck Converter Waterproof Module Car Truck Power Regulator Transformer
12 Review
TV Tuner LUMAX DV-2120HD
15 Review
EXuby Digital Converter Box For TV With RF/Coaxial And RCA Cable For Recording And Viewing Full HD Digital Channels Free (Instant Or Scheduled Recording, 1080P HDTV, HDMI Output, 7 Day Program Guide)
12 Review