The Siemens 6AV2123-2MB03-0AX0 is a human machine interface (HMI) device with a 4 inch, 16 million color display. It features a compact design, making it ideal for use in small machines and systems. It has a touch screen interface that allows for intuitive operation and control. The device supports communication via Ethernet and has two USB ports for connecting peripheral devices. The 6AV2123-2MB03-0AX0 is a part of the SIMATIC HMI basic panel series and is compatible with the TIA Portal engineering software.