USB POWERED: Temperature and humidity monitor is supplied power by USB cable, NO need Batteries, save money. If you have any questions about indoor thermometers, You will be support 7*24 hours by our service team./ SWITCHABLE & VOICE CONTROL: You can switch temperature unit between and by pressing the reset button and the mobile app one time. Wall temperature gauge indoor works with Alexa, Google Assistant. Wifi temperature sensor supports Alexa and Google home to ask for temperature and humidity, free your hands.WIFI THERMOMETER HYGROMETER -- REAL-TIME UPDATE & SMART APP CONTROL: Wireless temperature sensor wifi Connects with 2.4 GHz WiFi(doesn't support 5G WiFi), Accurate measurement real-time update without delay, you can remotely monitor temperature and humidity. Smart thermometer Hygrometer can help you effectively adjust situation of your wine cellar, greenhouse, basement or other places in time.ALWAYS ACCURATE & BUILT-IN CLOCK/TIME DISPLAY: The Swiss-made sensor monitors the environment reliably 24/7. Real-time data update, Manage the temperature and humidity in the most accurate way. WiFi thermometer hygrometer is equipped has a clock function and with clear LCD screen, you would get a clear view of time and date,You can check the current temperature humidity on LCD display, or you can get current and historic data via app.SMART SCENE TO TRIGGER DEVICES OR ALERTS: Alexa thermometer indoor can perform intelligent linkage. You can set a smart scene to trigger alerts through events like high/low temperature, high/low humidity conditions and more.You can set a condition in the smart scene that is the fan is turn on/off when the temperature reaches the limit value, or the dehumidifier in your room starts working once the humidity is over higher. Make your home smarter.