zebrafish

Hi, How would it work if I put a dash cam in a bedroom widow, which would be pointed towards the front door of my apartment? I was thinking of getting this one: http://www.ebay.com/itm/390899083670 It has its own internal battery. I don't know the range of motion detection. Would this work at all? Thanks!

So is that "upper class English twit speak" for laughing at me for not having the money for something great?