Package contents: 2 × W1209 digital temperature controller board. Features: The temperature controller board has full machine patch and wave soldering, ensuring stable performance and consistent appearance. The built-in CPU chip (MCU) provides intelligent operation with low power consumption. NTC probe: The probe is waterproof and enables temperature control for heating or cooling applications. Electronic digital thermostat: Includes a 3-digit LED display that is bright and easy to read. Supports both heating and cooling modes for convenient control of equipment and appliances. Operation tips: Long press SET to access the menu, starting at P0. Press + or - to navigate to the next parameter. Press SET to select a parameter, then use + or - to adjust the desired value. Press SET to confirm. Long press + or - to reset to default settings. Power off will also reset to default. Default temperature is 34.5°C. Size: 48.5 × 40.1 × 15.8 mm. Note: Measurements are manually taken; please allow for a 1–2 mm error. Color may vary slightly due to lighting and display differences. Actual product may vary slightly from images.