The SMART 109171 is a replacement controller module, often referred to as the SC9 controller, designed specifically for the pen tray of SMART Board 600 series interactive whiteboards. This essential component serves as the electronic interface between the pen tray and the computer, processing tool selections such as different colored pens and the eraser. It houses the USB connection port, enabling communication and ensuring the interactive whiteboard’s touch and tool functions operate correctly. This genuine replacement part is crucial for restoring functionality to a malfunctioning or unresponsive SMART Board pen tray.