Package includes: 2 × W1209 digital temperature regulator board, Features: The temperature regulator board has a full metal plate, wave pattern, stable performance, and beautiful consistency; The built-in CPU circuit, namely MCU, is more intelligent and consumes less power. NTC probe: The NTC probe is waterproof and can control temperature, allowing heating or cooling to be managed. Electronic digital thermostat: with a 3-digit LED display, extremely bright. Operable in both heating and cooling modes for easy control of equipment and devices. Tips: Long press to set menu, start at P0, press + or - to get next P-parameter, press set to choose this parameter, press + or - to select desired value for this parameter, press set to accept it, long press + or - = reset to default, power outage resets to default, standard temperature is 34.5 degrees Celsius. Size: 48.5*40.1*15.8MM Note: All measurements are manual, allowing 1-79 cm tolerance due to differences in light and display. There may be slight color and size differences between the photo and the actual item. Hope you can understand