That’s right you can get a home wifi security system for about $100 easy to install and operate even with no power and even call you directly instead of relying on wifi. It is possible. $100 wifi home security system with windows door water smoke carbon dioxide detector sensors.
The system you can get is DIGOO. Never heard of the brand? me neither, that don’t matter much because we know it work, and furthermore, similar brand name system cost 10 times more and need to pay monthly monitor at least $50 a month, no $5 $10 those are crap.
Any ways, you can get the DIGOO module for about $30-$40 on ebay, then get 6 door windows sensors for about $25 on ebay, and water detector $10 each at walmart, and smoke and carbon dioxide detector for $10 each. Up to you how many sensors you want to buy. Configuration is easy if you know how to use a cell android phone, it’s easy.
The system triggered it will monitor all the sensors via 433mhz, that’s a good thing since it does not require power or wifi to be connected, it will work if you don’t have wifi or power, since the system module uses rechargeable battery and sensor uses battery. It will call you or text you when alarm is triggered.