If it's on its own and the robot hears a loud noise or sees anything unusual it's been programmed to e-mail its owner to let them know there is a problem.
It's so clever that when its batteries run out, normally after about two hours, Wakamaru knows that it needs to recharge itself, so it does!
Mind you, all that doesn't come cheap, so if you've got your eye on one you'll have to have a spare £5,000 to pay for it.