Note: 1. Only compatible with Alexa and Google smart speaker. 2. Not waterproof, can only be used indoors, not suitable for outdoors. No need for a hub, use the WIFI network, check the temperature and humidity anytime and anywhere through TuYa app, and create a comfortable home environment. Features: Suitable for use in home, office, baby room, allowing you to monitor the temperature and humidity changes in the room in real time. Built-in temperature and humidity sensors: temperature sensor -20 degrees Celsius to 60 degrees Celsius and humidity sensor 0% RH to 100% RH. The sensor monitors the temperature and humidity in real time, You can view the temperature and humidity curve and real-time historical data in the TuYa app. Can be easily monitored remotely from within the TuYa app, and the same device can be viewed on multiple mobile phones. Can choose degrees Celsius or degrees Fahrenheit as the temperature unit through the app. The battery power can be monitored through the APP, and it will automatically alarm and remind when the power is low. Can ask the temperature and humidity of the room via Alexa or Google smart speaker. Wall mounted, with a adhesive, easy to install. Specifications: Material: ABS Color: White Size(LxWxThick.): 7 x 2.4 x 1.9cm Battery: 2 x LR03-1.5V / AAA batteries(Not included) Wi-Fi frequency: 2.4GHZ IEEE 802.11 b/g/n Detection temperature range: -20 degrees Celsius ~ 60 degrees Celsius Detection temperature accuracy: plus or minus 1 degree Celsius Detection humidity range: 0% RH ~ 100% RH Detection humidity accuracy: plus or minus 5% RH App name: TuYa Package Content: 1 x Indoor Smart WIFI Temperature and Humidity Detector 1 x User Manual