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. External Sensor: External sensor, with a wire length of 100cm. Temperature measurement range -40 ℃~120 ℃. 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 Bluetooth Function: Bluetooth function is only useful during configuration. After configuration, the device shut down the Bluetooth network. 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 Note: After the device configuration is completed, it needs to be placed in a position where the wireless signal is good, otherwise the power consumption of connecting to increase, which lead to fast battery consumption About Network Testing consume a lot of power To the service life of the battery, the sensor stop using when it does not need to report data Therefore, it is meaningless to test signal of sensors in APP. Error on temperature and humidity 1. All temperature and humidity sensors have certain errors, please note: The error of this sensor is ± 1 ℃ and the error of humidity is ± 5% RH, Any value within this range is normal 2. Sensor error and manufacturing process lead to certain errors between products of the same model 3. According to 's third law, the heat conduction takes a certain time. Therefore, our sensor needs 30 minutes to be consistent with the room temperature, and the measurement be accurate. Power Supply: 2 x AAA batteries(Not included batteries) Color: White & Black Material: ABS Package Contents: 1 * WiFi temperature and humidity sensor (with external probe) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.