High-quality sensor with top suppliers ensures reliable 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 variations are recorded in the app and displayed graphically. External Sensor: Includes an external sensor with a 100cm wire. Temperature measurement range: -40°C to 120°C. 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 device configuration. After setup, the device disables the Bluetooth connection. Temperature and Humidity Update Frequency: 1. The sensor uses a trigger mechanism. When temperature or humidity changes reach the threshold, data is reported immediately. Fastest update frequency is every two minutes; typically updates once per hour. 2. The sensor does not allow manual setting of update frequency. 3. Alarm settings are configured in the app; the sensor itself does not support alarm configuration. After configuration, place the device in an area with strong wireless signal. Poor signal may increase power consumption and reduce battery life. Network Testing Note: Testing sensor signal in 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 no practical benefit. Measurement Accuracy: 1. All temperature and humidity sensors have inherent measurement tolerances. This model has a temperature accuracy of ±1°C and humidity accuracy of ±5% RH. Values within these ranges are normal. 2. Minor variations between individual units 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 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) Note: Packaging includes only the items listed above. 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: ±1–3 cm.