Yes, definately worth the investment..
I even have the dollartree window alarm units on my fridgerator, my seven year old son sneaks food....
For 1$, they are cheap, but better than nothing..I have also modified one to accecpt a tripwire for an audible alarm...just by melting a slot over the battery cover, installing and turning unit on, then apply small strip of plastic between two of the batteries, when th ewire is pulled, it makes the battery connection complete, and squells until turned off or reset.
I even have the dollartree window alarm units on my fridgerator, my seven year old son sneaks food....
For 1$, they are cheap, but better than nothing..I have also modified one to accecpt a tripwire for an audible alarm...just by melting a slot over the battery cover, installing and turning unit on, then apply small strip of plastic between two of the batteries, when th ewire is pulled, it makes the battery connection complete, and squells until turned off or reset.
