Just got this a few days ago and was playing around with it last night. It's a small led light that mimics a television in a dark room. It also has a built in timer and light sensor so you can set it to come on in the dark for 4 or 8 hours. It works pretty well and it lights up the whole room when you're looking at it from outside. It ran me $15

The only thing I don't like about it is that it's not completely random. There is a pre-programmed lighting sequence. But I'm not sure if this is something I noticed because I knew to look for it. Just another idea for those vacant properties....

Here is what the little box looks like

My camera wasn't the best at shooting in the dark but here is a little sample video.