STM32F072 MCU, supports for Klipper Firmware 6-layer PCB design, all solid capacitors and capacitors Onboard 2 M3 3.5mm isolation columns, no need for printed parts, easy to install Onboard CAN/USB switch Onboard RESET and BOOT0 buttons for easy firmware update SB COMBO V2 is a newly designed SB tool board running for Klipper firmware. Based on STM32F072, it provides two communication modes: CANBUS and USB. The onboard USB HUB has up to three USB interfaces, which can be used to connect to the scanning leveling sensor (Scanner Leveling Sensor,such as IDM or Cartographer )and AI camera, etc. It can also be connected vertically with an optional board for easy use. Fan control/heating both use high-power MOS, and lower heat Onboard 5V@3A DC-DC, 5V load can reach 15W XT30 interface, customized connection cable comes with the board Onboard USB2.0 HUB, 3x USB2.0 interface (one of which is located on the auxiliary board) Support CAN / USB2.0 connection Supports auxiliary board connection For front cover quick install & remove Support Auxiliary board connection for quick installation and removal of the front cover. You can add 1 x USB, 2 x 3-wire fans, 1 x RGB by the auxiliary board Onboard TMC2209, 3 x Fans, 3 x IO with level converter, 1 x RGB,1 x Heat, 1 x thermistor, 1 x status LED ADXL345 Accelerometer onboard USB-C onboard for Firmware update Colour:Black Material:PCB+Plastic+Metal Package Contents: 1 * connection board 1 * tool board 1 set * accessories Only 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.