This is a DIY 4digit digital clock kit designed for education and hobbyist projects. Key benefits Education ready: suitable for college teaching training, electronic interest training classes, and electronic hobby production. Handson learning: provides practical experience with microcontroller control, realtime clock operation, and LED display. Clear, visible display: drives a 4digit 1inch digital tube with luminous color options. Userfriendly starting point: the chip comes with a program, enabling a straightforward build when installation and welding are correct. What it is and how it works The circuit is controlled by a 51 microcontroller. It uses DS1302 as the clock chip. It drives the 4digit 1inch digital tube to emit light through a triode. Display and color options Luminous colors available for the 4digit display. Programming and assembly The chip comes with a program, and with proper installation and welding, assembly can be successful in one go. Compatibility and performance Designed to work with 51 microcontrollerbased configurations. Provides a functional 4digit digital clock with a DS1302 clock chip and LED display, suitable for educational and hobbyist applications. Use scenarios In college teaching labs and classroom training to illustrate microcontroller control, timekeeping, and digital displays. In electronic interest training classes for handson learning with basic soldering and circuit assembly. In hobby projects or maker spaces for experimentation and smallscale electronics production.