I use mine in my hotel room when out of town. I set it up with no flash and it records anyone entering the room. All I have gotten to date is the maids coming in to do clean up, but if anyone unauthorized ever enters they will be busted, provided they don't steal the camera.
All you need as a digital camera with a security (no flash) mode. Of course at night, infrared would be best. It is also easier if you use one with a SD card. That way you can review it daily on your laptop, or in your digital camera for that matter.