High-quality sensor with reliable components for accurate measurement data. APP remote monitoring and recording: The sensor reports temperature and humidity changes, which can be viewed on the app or display screen. Temperature and humidity changes are recorded in the app and displayed in graphical format. External sensor included 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. External sensors must not be placed in food or drinking water. 3. External sensors support temperature measurement only, not humidity measurement. Bluetooth function: Bluetooth is used only during setup. After configuration, the device disables the Bluetooth connection. Temperature and humidity update frequency: 1. A trigger mechanism is used data is reported immediately when temperature or humidity changes reach the threshold. Maximum update frequency is every two minutes; typically, updates occur once per hour. 2. Update frequency cannot be customized on the sensor. 3. Alarms cannot be set on the sensor; alarm settings are configured in the app. Note: After configuration, place the device in an area with strong wireless signal. Poor signal strength increases power consumption and reduces battery life. Network testing note: Frequent signal checks consume significant power. To extend battery life, the sensor enters sleep mode when not reporting data. Therefore, testing sensor signal strength in the app is not recommended. Temperature and humidity accuracy: 1. All sensors have inherent measurement tolerances. This model has a temperature accuracy of 1C and humidity accuracy of 5% RH. Values within these ranges are normal. 2. Minor variations between individual sensors of the same model may occur due to manufacturing processes. 3. According to thermodynamic principles, heat transfer requires time. Allow approximately 30 minutes for the sensor to acclimate to ambient 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) Note: Light reflection and differences in display screens may cause slight color variations between the product image and actual item. Measurement error allowance: 13 cm.