NOTE: 1. wifi models do not need a gateway, zigbee models need a Tuya zigbee 3.0 gateway to use2.ZigBee version product must be used with the Tuya ZIgbee gateway and cannot be used alone.Before adding this device, you need to add a ZigBee 3.0 smart gateway (gateway needs to be purchased separately or in store) Attention:(zigbee energy monitoring version) If the energy monitoring data does not appear in the APP, do not question the smart switch. Please replace the zigbee gateway you are using. The reason for the energy monitoring data not showing up is because of the gateway version. It can be solved by contacting the gateway manufacturer or replacing the gateway with another zigbee gateway. Features --[Power Statistics Function] View energy reports to properly track your home's energy usage. Find out which appliances consume the most energy and make plans to save energy and electricity bills.--[Mini Body] We are smaller, more convenient and easy to install, we can put it directly in the switch bottom box. So you don't have to climb stairs to install the controller--[Two ways to connect] The controller is only connected to N and L wires, not to the switch. This smart DIY switch can be used with your old 2 Gang control switch. In particular, you can still manually control the old switch after installation.--[Voice Control] Fully compatible with Alexa and Google Home/Tmall Genie.--[Timer function] Set the time to turn on the lights, set the cooking time...--Grouping functionCan turn off or on grouped devices together, more convenient --Flame retardant materialMore safe to use--[3 restart states] default on or off, or memory state, go out without worrying about the state of the light Main Specifications Input voltage: 100-240V 50/60HzMax. Load current: 16AWiFi standard: 2.4GHz 802.11 b/g/nApplication name: Tuya Smart / Smart Life