1、EXPANSION INTERFACE: The expander come with 4 fan ports, 2 temperature ports, 1 RGB port, 3D printers like for VORON have too many modifications, such as additional model cooling, motherboard cooling, cavity temperature detection, RGB lights, etc. Regular board ports can no longer meet the expansion needs, this expansion module can provide additional interfaces for your device 2、MOSFETS MODEL: 3D printer adapter board has 4 x 3A Mosfets of PA0, PA1, PA2, PA3 to control LEDs, heaters, fans, and other accessories 3、THERMISTOR(PA5, PA6): The 3D printer expander board connect to pins PA5 and PA6 using the 2 thermistor inputs (for Klipper by default) of the 7K pull up resistor 4、1 CONNECTOR: The 3D printer expansion board has a power input pin(NPV) that provide the voltage you need(5V or 12V) and pass to a three pin plug(Vin, Data, Ground) connected to the J1, which has the NPV power voltage GND 5、APPLICABLE MODEL: 3D printer expander module is suitable for VORON series, plug and play, improved design with excellent components, only for Klipper system, this extender must be connected with host USB. Compatible with for Voron series 3D printers and other 3D printers that also use motherboards with for Klipper firmware 1 x 3D Printer Expander Module Item Type: 3D Printer Expander ModuleFunction: (NPV) Can Provide The Voltage You Need: DC5V 12V(1 Connector): A power input pin(NPV) that provide the voltage you need(5V or 12V) and pass to a three pin plug(Vin, Data, Ground) connected to the J1, which has the NPV power voltage GNDExtender Interface: 4 x Fan ports, 2 x temperature ports, 1 x RGB port