It is a WiFi smart switch with DIY functionality that allows you to control connected devices directly from your phone via eWeLink or have it turn on/off devices via Amazon Alexa and Google Smart Assistant. It has a DIY mode with user-definable firmware and a built-in web server with a public REST API that allows you to connect the switch to your existing home automation system. Documentation of protocols and code for DIY mode tools compatible with Vera, Fibaro, HomeSeer, Savant, Home Assistant, etc. (updated)Simply set a timer to have your device turn on/off automatically at a preset time of day. For example, have the coffee maker ready at night and a cup of coffee ready the next morning. Compatible with IFTTT functionality, you can take additional actions to trigger other devices or receive notifications on your phone after triggering an action.In addition to supporting smart scenes, you can turn on/off another device or a large group of devices by simply setting the device to on/off. LAN control is suitable for situations where there is no available Wi-Fi connection or unstable Wi-Fi network environment. A convenient option for shared control is to allow you to manage the same device with family or friends, simply share on the eWeLink app to try it out.Note: SONOFF BASICR3 does not have 433Mhz RF receiver module, if you need it with 433Mhz RF function, the purchase link is as follows.Model:SONOFF BASICR3(Support cell phone remote control)Size:95*45*30mm Net/Gross weight:65g/70gWireless standard: 2.4GHZ, 802.11 b/g/nVoltage:100V~240V AC(50/60Hz)