4-Digit Digital Electronic Clock Kit with Microcontroller-Based Digital Display

This 4-digit electronic clock DIY kit requires manual welding and assembly, making it suitable for hobbyists and electronics students practicing circuit construction. It operates on DC power between 3.7V and 5.5V and features a battery backup interface to maintain timekeeping during power interruptions. 1. Constructed from plastic with external dimensions of approximately 53 by 40 millimeters. 2. Designed for hands-on assembly by electronic enthusiasts and vocational training programs. 3. Supports DC 3.7V to 5.5V input and includes a connector for 3V backup power compatible with two or three AA batteries or standard mobile packs. 4. Provides independent hour and minute adjustment, second correction, nine-level speed calibration, a toggleable hourly chime, and a separately controlled two-way alarm. 5. Package contains one complete clock assembly kit; the microcontroller chip comes pre-programmed with no downloadable software versions supplied.