AT89C2051 Six-Digit LED Clock Kit with PNP Transistor Driving and Buzzer

Six Digit Clock Assembly Kit with AT89C2051 Preloaded Firmware DC 6-12V

DIY Six Digit Clock Kit Based on AT89C2051 for Learning Digital Electronics

4 Digit LED Clock Kit for Beginners with Alarm Timer Stopwatch and 52x55mm PCB

DIY 12V Clock Kit with For Alarm Countdown Timer and Stopwatch Function

4 Digit LED Clock Kit for Beginners with Alarm Timer Stopwatch and 52x55mm PCB

Digital Clock DIY Kit 12V Power Input for Alarm Stopwatch Timer and Counter

12V Digital Clock Kit with Push Button Control for Alarm Stopwatch Timer Setup