Features: Main control chip: OctopusV1.1 mainboard adopts ARM CortexM4 series STM32F446ZET6 32-bit microcontroller, 180MHz, 512Kb flash Supports running Klipper andMarlin firmware (note: input voltage only supports 24V, not 12V) Online/offline printing: Supports "printing from SDcard" and "printing through UsbOTG" using the integrated USB-A port. The USB-C interfaces supports analogserialports, allows printing through USB, and supports CAN bus connections usingEthernet connectors. It provides up to 6 controllable PWM fans and an additional 2 uncontrolled fans, with voltage selection from 5V, 12V, or 24V. Highprecision: SFS V2.0 intelligent filaments sensor adopts highprecision photoelectric induction technology, which is more accurate in detection. SFS V2.0 will provide corresponding indicator lights for different problems, and issue error alarms on the screen in a timely manner, automatically pausing printing, saving resources. Bidirectional feed upgrade: TheBTT intelligent filaments sensor V2.0 is not limited by the installation direction of the filaments, eliminating concerns about direction, achieving fast, simple installation and flexible positioning to maximize space expansion. Supports Klipper/andMarlin/RRF firmware. Specifications: Main Control Chip: OctopusV1.1 Adopts ARM CortexM4 series STM32F446ZET6 32-bit Microcontroller Frequency:180MHz, 512Kb flash Firmware:Supports running Klipper andMarlin Size: Mixed as pictures Filaments sensor:BTT SFS V2.0 Step Motor Driver: 8PCS TMC2209V1.3 for Voron 2.4 3D Printers Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1PC OctopusV1.1 Control Board 1PC BTT SFS V2.0 SmartFilament Sensor 8Pcs TMC2209V1.3 Step Motor Driver Kit