Help one of my house got ROBBED

[Anh Truong]

I got robbed last week in one of my vacant houses. I was juggling three houses and forgot about checking  on the other one. The house that got robbed is located in a sketchy neighborhood. I have a hard time trusting my neighbors, they're always staring at my house from a distance. They stole some appliances a washer and stove. They also damage my hardwood floors while carrying out the appliances. The entire neighborhood was probably in it for themselves. I filed a police report and to my avail their finger prints are smeared all over the door. No accurate finger prints were made. Police won't do anything about it. 

Again, the house is vacant while i flip it. There is no wifi. My question is, what security alarm works  best without wifi? I want a security alarm that connects to my phone without using wifi. I've decided once i sell this house, i'll transfer my security alarm to my other houses.