High-precision sensor - built-in upgraded MEMS sensor, refreshed every second, providing more timely and accurate data. Temperature error up to 0.5(1) and humidity error up to 5%. Using 5.0 Bluetooth chip, the temperature sensor provides real-time wireless monitoring of temperature (-20-60) and humidity (0-100RH). Upgrade to 50m (164ft) connection distance (in open areas). Wireless APP Control - The temperature sensor uploads data to the app when connected to the app via bluetooth. You can check the maximum and minimum values of temperature and humidity on the APP. Smart Reminder Reminder - When the data exceeds your preset value, the data on the APP will turn red and a notification will be sent to your mobile phone to remind you and your family about the changes in temperature and humidity. It can be used to monitor homes, pets, refrigerators, freezers, walk-in coolers, wine cellars and greenhouses. Data storage export - The wireless thermometer hygrometer will record data in the APP every 10 seconds for a total of up to 100 days.