My robot idea is a mobile secu

My robot idea is a mobile security cam. His job is to wander around outside and be eyes and ears on the ground. If somebody walks in the yard, or starts messing with the car out front, he will intervene, or at least record some video and send me an alert. If he gets stolen or bashed, that could be a problem. So long as he sounds an alarm, what else can you do? Nobody has any legitimate reason to interfere with him. Or maybe I'd set him up on the front yard on a post adjacent to the sidewalk, scarecrow-style, and he can wish people good day! And crack jokes or something. And perform sentry duties.