4-digit digital watch set controlled by a 51-series microcontroller. It uses the DS1302 real-time clock chip and drives a 1-inch 4-digit digital tube that emits light via a triode. Bright colour variants are available. The chip includes a pre-loaded program, and with proper installation and soldering, it can be set up quickly. Key benefits - Real-time clock functionality with DS1302 for reliable timekeeping in your projects. - Compact 1-inch 4-digit display for easy integration into small devices. - Pre-loaded program enables quick setup after correct installation and soldering. - Bright colour options ensure clear readability in various environments. Specifications and compatibility - Microcontroller: 51-series - Clock chip: DS1302 - Display: 1-inch 4-digit digital tube - Drive: triode - Colour options: bright colours Use scenarios - Academic training and electronics education - Electronics hobby courses and DIY projects - Time display modules for clocks, timers, or status indicators in small devices This description preserves the original model and function while presenting the key benefits, clear specs, and practical applications in a concise, professional format.