WPW-230 is kind of wireless power switching that allows you to power ON/OFF the home appliance manually or remotely or triggered by other UIS sensors. While turning on the switch, the inside meter will start measuring the power status, and calculate the cumulative energy usage. It supports overload protection to protect your home electrical appliance from damaging by unexpected power surge, and it is also a wireless router that allows sensors to join to extend the wireless communication distance.