1、Main Control: 3D printer controller board is based on STM32F446 180Mhz, all IO can withstand 5V voltage, support 8 TMC stepper drivers, support Uart and SPI. 2、Voltage Input: 3D printer controller board maximum 28V input, 12V at 5A DC‑DC, 5V at 8A DC‑DC (for Raspberry Pi only), 3.3V at 0.8A LDO. 3、Switch Socket Optional: 3D printer motherboard limit switch socket 24V/5V/3.3V optional, prepare more other equipment, such as inductive sensor, BL Touch. 4、8 Way PWM Fans: Up to 8 way PWM fans (using only 1 extruder, not using 12V/24V RGB), 2 way RGB LED (12V and 24V optional), 1 way 5V‑RGB LED (NEO‑PIXEL /WS2812). 5、10x PWM Power: 10x PWM Power MOSFET outputs (1 for HotBed, 3 for HotBed, 3 for Fan, 3 for RGB LED Strip). Item Type: 3D Printer Controller Board Material: PCB Number of PCB Layers: 6 Layers Master: STM32F446 Flash: 512K DC Input: 12V at 3A DC-DC For Raspberry Pi Power Supply: 5V at 5A DC-DC Fuse: 2+1 3.3 Power Supply: 2 (MUC and motor are powered separately) High Voltage Drive Interface: 2 Drive TVS: 8 Thermistor Plug: 6x2Pin Heating Rods: 4 CNC Fans: 6 Normally Open Fans: 2 Support: WiFi Module Supported Firmware: for klipper, for Marlin, for RRF Support System: For Raspberry pi, for Spider 1 x 3D Printer Controller Board 1 x Type-C Cable 1 x Connecting Cable 30 x Pin Shells 1 x Connector