External Sensor: External sensor, with a wire length of 100cm. Temperature measurement range -40 ℃~120 ℃. About Bluetooth Function: Bluetooth function is only useful during configuration. After configuration, the device shut down the Bluetooth network. High : The Sensor uses top suppliers. It can the high of the measurement data. APP Remote monitor and Recording: The sensor report when the temperature and humidity. You can view the changes in the value on the APP or display screen. Record the temperature and humidity changes on the APP, and use the graphics to show you. NOTE: 1. The temperature and humidity sensor of battery version cannot report data in real time. 2. External sensors should not be placed in food or water that people drink. 3. External sensors only support temperature measurement. Does not support humidity measurement. About the update frequency of temperature and humidity: 1. We used the trigger mechanism When the temperature or humidity change reaches the trigger condition, report the data immediately The fastest update frequency is two minutes. Generally, the data is updated once an hour. 2. The sensor cannot set the update frequency. 3. The sensor cannot set alarm, and the alarm function is set on the APP, Weight: 0.10361726314 pounds, Manufacturer: melairo