Now-a-days, it is easy to keep guards outside the house for home security. But always people cannot rely on guards. In some cases, people will lock the house for long days. This paper is composed of a surveillance robot and a docking station. The palm-sized surveillance robot has a triangular shape with three wheels. It communicates with the general wireless home router through Wi-Fi. It communicates with the docking station through ZigBee and serves as a mobile wireless sensor network gateway. The docking station has a trapezoidal structure with an arc-shaped docking interface.