Surveillance robots are already being used by many businesses these days. The Remocon Rover is designed for your home. It lets you check on your home while you are away. It is internet connected and can be driven via a smartphone or computer. You will be able to check a live feed while away.
This robot comes with a charging station. You can steer it like a remote control toy. It is available for $250 at the time of this writing. More information is available here.