The Siemens 6FC5403-0AA10-0AA1 is a SINUMERIK Handheld Terminal HT 6, designed for use with SINUMERIK 810D, 840D, 840DI, and SIMATIC FM 357-2H systems. This device serves as a portable Human-Machine Interface (HMI) and Machine Control Panel (MCP), facilitating efficient machine operation and programming. Key features include a 5.7-inch monochrome LCD screen with a resolution of 320 x 240 pixels, providing clear and precise display capabilities. The terminal is equipped with a membrane keyboard, softkeys, function keys, and dedicated machine control buttons such as JOG, AUTO, MDA, REPOS, and REF, ensuring intuitive operation. Safety is paramount, with an integrated emergency stop button and two 3-position switches located on the back of the device. Connectivity options include MPI, RS232 (V.24), and PS/2 interfaces, along with support for PC cards and memory cards, enabling versatile data storage and transfer. Powered by a 24 V DC supply, the terminal is housed in a robust enclosure measuring approximately 290 mm in diameter and 53 mm in depth, with a weight of 1.5 kg, making it suitable for industrial environments. This handheld terminal is an essential tool for operators seeking reliable and efficient control over their CNC systems.