What kind of security system do I need?

-I am having trouble with my step-son coming to our house when I am out of town and going through things. I know that things are out of order but he denies that he goes through things.



I was wondering what kind of video surveillance system I need to monitor my house. I want it wireless, only to record when it detects motion, and save it to an SD card or something similar.



Links to products would be great or if you have any personal experiences with products. Thanks!If you want to save a lot of extra money, go by you a baby monitor with a small tv and camera and hide it somewhere and it's so much cheaper. Plus it picks up every sound, because its meant for babies. They're very small and have night vision, my friends father used to use them for around the outside of the house in windows and you can easily just put them inside a stuffed animal or something.