High-quality sensor using components from top suppliers to ensure reliable measurement data. APP remote monitoring and recording: The sensor reports temperature and humidity data, allowing you to view changes via the APP or display screen. Temperature and humidity variations are recorded in the app and displayed in graphical format. External Sensor: Includes an external sensor with a 100cm cable. Temperature measurement range: -40C to 120C. Note: 1. The battery-powered version of the temperature and humidity sensor does not support real-time data reporting. 2. The external sensor should not be placed in food or drinking water. 3. The external sensor supports temperature measurement only and does not support humidity measurement. Bluetooth Function: Bluetooth is used only during device setup. After configuration, the device disables the Bluetooth connection. Temperature and Humidity Update Frequency: 1. The sensor uses a trigger-based mechanism. Data is reported immediately when temperature or humidity changes reach the trigger threshold. Fastest update frequency is every 2 minutes; typically updates once per hour. 2. The sensor does not allow manual setting of update frequency. 3. Alarm settings cannot be configured on the sensor; alarms must be set through the app. After completing device configuration, place the sensor in a location with strong wireless signal. Poor signal strength increases power consumption and reduces battery life. Network Testing Note: Testing the sensor's signal through the app consumes significant power. To extend battery life, the sensor enters sleep mode when not actively reporting data. Therefore, signal testing in the app is not recommended and provides limited value. Temperature and Humidity Accuracy: 1. All temperature and humidity sensors have inherent measurement tolerances. This sensor has a temperature accuracy of 1C and humidity accuracy of 5% RH. Values within these ranges are considered normal. 2. Variations in manufacturing processes may result in slight differences between individual units of the same model. 3. According to the principles of heat transfer, thermal conduction requires time. Allow approximately 30 minutes for the sensor to acclimate to ambient room temperature for accurate readings. Power Supply: 2 x AAA batteries (batteries not included) Color: White & Black Material: ABS Package Contents: 1 x WiFi Temperature and Humidity Sensor (with external probe) *Only items listed above are included; other accessories are not included.* Note: Lighting effects and display differences may cause slight color variations between the product image and actual item. Measurement error allowance: 13 cm.