The thermistor interface uses a combination of a capacitor and a varistor for protection, enhancing the resistance of the interfaceRich extension modules, stable, easy to use, and previewable.Reserve a closed-loop drive interface to the hassle of external plug-in adapter modulesPluggable external DC5V power moduleMultiple fan interfaces: 1 CNC fan, 3 normally open fansMicroprocessor:ARM -M3 CPUInput voltage:DC12V-DC24V 5A-15ALogic voltage:DC 3.3VWIFI module:ESP-01SDriver working mode support:SPI, UART, STEP/DIRMotor drive interface:X, Y, Z, , E1, five channels (each channel has a closed loop up to 256 subdivisions)Supported file format:G-codeSupported machine structures:, , kossel, , corexyNote:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Not Affect The UseColour:YellowMaterial:PlasticPackage Contents:2 * SKR 1.4 MotherboardOnly 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.