Hi-Tech / Low-Cost Electronic Tripwire Alarm

I had this idea a couple years ago for a very loud, very simple electronic tripwire alarm. It doesn't use radio signals, wifi, or anything like that. It's just a simple tripwire that makes a heck of a lot of noise if somebody triggers it. At a cost of around $15.00 plus some fishing line or cordage, you can be sure to know if somebody wanders their way into your area unexpectedly. Here is the electronic alarm I used: https://amzn.to/2YOdHFd