Tuya or smart life app can be used to remotely control the switch on/off your air conditioner/water heater from your smart phone with Wi-Fi or 4G network anytime anywhere you are, no hub required, you could turn on your water heater/ air conditioner in advance, then enjoy a hot shower when arrived. Timer and Schedule Function: Take full control of water, you could plan the exact time to turn water heater appliances on/off automatically. All Families Members Could Control: This smart switch can have several control sites shared by different family members. One mobile phone can control many switches also. Remote Control: Instantly turn on/off your appliance with your smart phone. The free app allows you to add as many smart switches as you'd like to keep track of multiple appliances. Wide Compatibility: The switch can be compatible with both iOS and Android Mobile System, works with Tuya smart, Amazon Alexa/Echo, Google Home. It can be connected to other smart devices to realize a convenient smart life together