Feature: 1. TECHNICAL PARAMETERS: 3D printer motherboard uses 32 bit high speed ARM chip as the main control chip for STM32F407, the main frequency is up to 168MHz, with FPU floating point arithmetic unit. (compared to for RoBIN for STM32F103 (72MHZ) and other 16MHZ, the data processing power is stronger and faster) 2. EFFECTIVE HEAT DISSIPATION: The circuit board is made of quality 2 layer board, and is specially optimized for heat dissipation. The use of quality for MOSFET tube, bring better cooling effect 3. INPUT POWER: The 3D printer control board uses a dedicated power chip to support 12-24V power input. The same system power can reduce the hot bed current to 1/4, effectively solve the hot bed for MOS tube heating problem 4. MULTIPLE PROTECTINGS: 3D printer controller board industrial grade chipsets make printing more accurate and fast. Has over current protecting, overload protecting, over temperature protecting, pre overtemperature remind and other safety functions(automatically turn off the heating switch) 5. OFFLINE UPGRADE: The 32 bit 3D printer control board supports offline upgrade. Copy the upgrade file to the memory card(not included) and insert into the 3D printer to complete the program upgrade 6. LOW VIBRATION WITHOUT VIBRATION: The motherboard built in A4988 motor driver chip, low resonance, 256 microstep subdivision, to achieve stepper motor operating without jitter or out of step Specification: Item Type: 3D Printer Motherboard Size: Approx. 130 x 100mm / 5.12 x 3.94in Microprocessor: For STM32F407 Input Voltage: 8-35V(support 12-24V) Motor Driver: For A4988D Sensor Type: 100K thermistor Firmware Update: Supports small memory card(not include), USB flash drive update Print Mode: Supports offline printing, online printing Power Outage Resume Printing: Yes Filament Runout Detection: Yes. Package List: 1 x 3D Printer Motherboard