Pert 4-node is wifi enabled device, which can control upto 4 switches in your existing switch board with your smartphone. The wi-fi enabled pert allows you to turn lights on and off from anywhere across the house, locally, or from the other side of the world through internet. Pert 4-node fits inside your standard 4 module switch board in your home and can be controlled remotely with an android smartphone or tablet, iphone, ipad. It works with your existing wi-fi network and anywhere your smartphone or tablet has an internet connection. The pert app also allows you to monitor your energy consumption, and helps you save energy. You can schedule your devices to turn on/off at a particular time. Device can be installed by any electrician, who can understand your wiring. Installation video has detailed steps in installing and configuring the device. Ac specifications operating input power range---90vac-264vac±5%, 47-63hz. Maximum load / relay---200w resistive load @ 230vac input.150Va inductive load @ 230vac input. Dimmer output power for inductive loads--- 10va - 150va @ 230vac. General specifications power consumption--- <0.2W no load <1.0W loaded. Temperature--- operation 0°c to +50°c.Storage -20°c to +70°c. Relative humidity--- operating 5%rh to 95%rh non-condensing.Storage 5%rh to 95%rh non-condensing. Dimension--- 91.5Mm x 51mm x 23mm rf frequency--- 2.45Ghz.