1、The circuit board is specially designed for CNC machining such as 3D printer, engraving machine and so on. 2、With the high performance USB chip Atmega 16U2, can be compatible with all Ramps-related firmware. 3、5 temperature sensor interface input. 4、All pins are introduced to make it easy to do more multi-function expansion. 5、With LCD extension interface, you can connect memory extension version of Chinese LCD screen to realize off-line printing (support 2004 and 12864). Features: 1. The circuit board is specially designed for CNC machining such as 3D printer, engraving machine and so on. 2. With the high performance USB chip Atmega 16U2, can be compatible with all Ramps-related firmware. 3. 5 temperature sensor interface input. 4. All pins are introduced to make it easy to do more multi-function expansion. 5. With LCD extension interface, you can connect memory extension version of Chinese LCD screen to realize off-line printing (support 2004 and 12864). 6. Extension interface, easy to add automatic leveling function. 7. PWM DC output: heating tube, fan, etc. 8. Power supply: power input is 12V and 35V, dual power supply design. Specifications: Condition: 100% Brand New Item Type: RUMBA Mainboard Material: Metal Size: Approx. 175 * 135 * 30mm / 6.9 * 5.3 * 1.2inch Weight: Approx. 187g Package List: 1 * RUMBA Mainboard 6 * TMC2100 Driver 6 * Cooling Fin 1 * Screwdriver 1 * Data Cable