Since the Moscow murders I have gotten a Ring camera. Also bought motion lights for my back and side yards. Before all of this I purchased window, gate and door sensors which I love because I can set it up so I get alerts at night if any of my doors or windows open or if someone opens my gate. It came in handy when my little neighbor girl opened my gate to pet my dogs and left it open. I came out before they escaped! So I haven't yet foiled a burgler but I did catch an 8 year old!
Here's a link to the sensors in case anyone is interested: (you need to purchase the Hub as well, but all of this is wireless and connected to an app. No monthly fees)