Highprecision sensorBuiltin upgraded MEMS sensor, it updates once per second to provide more uptodate data with higher accuracy. The temperature error can be up to 0.5℃1℉, the humidity error can be up to 5. With 5.0 Bluetooth chip, the temperature sensor provides wireless realtime monitoring of temperature 2060℃ and humidity 0100RH. Upgraded to 50m 164ft connection distance in open area.Wireless APP controlThe temperature sensor uploads data to the app when connected via Bluetooth. You can check the max and min temperature and humidity values in the app. A smart device can connect to up to 100 temperature sensors at the same time and supports Android 4.3 or later, iPhone 4s or later.Smart reminder alertThe data in the app will turn red and send a message to your mobile phone to remind you and your family of temperature and humidity fluctuations when the data exceeds your preset value. It can be used to monitor homes, pets, refrigerators, freezers, cold rooms, wine cellars and wet houses.Data storage portWireless thermometer hygrometer records data every 10 seconds in the app, which is a total of up to 100 days. Make sure your phone comes within reach of it at least once a day. Possibility to download data in CSV format for free after registering an account.Mini portable designOur wireless temperature and humidity sensor is smaller than others 1.51.50.62 inch and has a builtin CR2477 battery, it weighs about 37 grams per piece. The battery life is about 10 months. A hanging hole is designed for different placements as you like. Spacesaving and practical. Please contact us if you have any problems with the item and our service, we will try our best to solve the problem.