WiFi Thermometer Hygrometer This device doesn't need a hub. You can switch between ℉ and ℃ for temperature units, view history records, and access temp - humidity graphs. Smart Scene for Alerts or Device Control Through the app, you can create a scene. An alert will be sent to your phone if the values go beyond the preset ones. You can also set up a scene to automatically turn on your AC when the temperature reaches a limit, or start the dehumidifier in your room once the humidity is too high. Compact Design and Multiple Installation Options The indoor WiFi thermometer hygrometer is small enough to be placed in potted plants, reptile vivariums, cigar humidors, and other small spaces. It's useful for monitoring your baby's room or wine cellar. You can either place this wireless remote thermometer anywhere in your house or mount it on the wall or other places using the sticker or screws. Low Power Consumption and High - Quality After - sales Service The WiFi temperature sensor uses a low - power - consumption microprocessor for long standby. When the sensor's battery is low, you'll receive an alert message via the app. Specifications Part number: WiFi Hygrometer Thermometer Sensor Item Weight: 50 g Package Dimensions: 8.7 x 4.5 x 2.4 cm; 50 Grams Batteries: 2 AAA batteries required