Melzi 2.0 controller 1284P 1. Voltage: 12V 2. IC: ATMEGA1284P 3. FT232RL USB interface 4. 4 pcs A4988 stepper driver 5. Heated Bed: MK1/MK2a/MK2B/MK3 6. With miniSD card socket 7. With three MOSFET driver hotend, heated bed and cooling fan 8. Size: 210mm*50mm*17mm