The thermistor interface uses a combination of a capacitor and a varistor for protection, enhancing the resistance of the interface Rich extension modules, stable, easy to use, and previewable. Reserve a closed-loop drive interface to the hassle of external plug-in adapter modules Pluggable external DC5V power module Multiple fan interfaces: 1 CNC fan, 3 normally open fans<br><br>Microprocessor:ARM -M3 CPU Input voltage:DC12V-DC24V 5A-15A Logic voltage:DC 3.3V WIFI module:ESP-01S Driver working mode support:SPI, UART, STEP/DIR Motor drive interface:X, Y, Z, , E1, five channels (each channel has a closed loop up to 256 subdivisions) Supported file format:G-code Supported machine structures:, , kossel, , corexy Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Not Affect The Use Colour:Yellow Material:Plastic<br><br>Package Contents: 2 * SKR 1.4 Motherboard<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.