When using Alexa, you need to bind the device in the Dollin Smart APP first, so that you can use the Alexa speaker to awaken the bound device. You can say "Alexa, please turn off the water heater" to Alexa, it will turn off the water heater, and the core evoked vocabulary is "turn off the water heater"; or "Alexa, set xxx temperature to 28 degree", it can also To help you set the temperature of a certain device to 28°C, the core evocative vocabulary is "set xxx temperature to 28 degree", where XXX stands for a certain device bound to Dollin Smart, using the your name.You can read the detailed instructions for binding Alexa in the Dollar Smart APP to help you use it.