This item product is composed of wifi master socket and 433 RF salve controlled sockets,one wifi master socket can control at most 7pcs 433 RF salve controlled sockets.Wifi socket can be used to control household appliances via your smart phone apps at any place as long as can search wifi signal.Meanwhile,the apps of smart phone also support the control of multiple sockets.Household appliances such as electric water heater,lighting device etc could be controlled locally or remotely as you want.