Wireless Temperature Sensor Build-in Swiss-made SHT30 high precision sensor, with ±0.3°C temperature and ±3% humidity accuracy. the temperature sensors monitor the temperature and humidity changes and transmit the data to the Wifi Gateway . The completely sealed waterproof smart sensor make it possible for indoor and outdoor uses. Wifi Gateway The Wifi Gateway work as bridge to connect with your router( Wifi )and the wireless temperature sensors, It syncs the temperature and humidity data every minute and upload to your cellphone. The Wifi Gateway can connect with multiple sensors, name each sensor like living room, Greenhouse on the app to easily monitor different environment. Govee Home App The app allows you to remote monitor the indoor and outdoor house temperature and humidity while you’re away from home, Battery Level display and Calibration available on the app. And Alert changes and notification will be sent to your phone when the data exceed the setting value. How it works 1: Plug the Wifi gateway into socket 2: Open the battery cover and pull out the insulating tab 3: Download ‘Govee Home’ on App Store or Google Play to your cellphone 4: Open the app and sign up an account with your email. You can also export the data as csv. format to this email 5: Click the icon '+' at the top right corner and select H5040 device 6: Follow the app prompt to connect your wifi Gateway with your router(not support 5G wifi) 7: Name each sensor like Basement/Cigar Humidors/Wine Cellars/Greenhouses/Dog House and put the wireless temperature sensors on the environment you’d like monitor 8: Set up an alarm temperature or humidity. monitor the temperature and humidity as long as your phone has signal, no distance limited