Franzis Alarm System Kit

Price: $38.63
(as of May 06, 2023 11:26:30 UTC – Details)

Prevent anyone getting passed you without you noticing it! You won’t have to lay any cables or install light barriers. With the Franzis Alarm System you can build your own security device.
Build your own small security device
Includes all the components required to build
Solder the components to the pre-assembled circuit board
Responds to variations in air pressure when doors or windows are opened or closed