4-Digit Electronic Clock DIY Kit with 7-Segment Display

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*Disclaimer: The images are merely illustrative.

Features:

Weight:24g
0.44-inch red digital tube for clock display
Imported AT89C2051 as the main control chip
1.6mm thick PCB is made of military-grade FR-4 plate
There are not many components,simple installation,high success rate,do not debug
Accurate timekeeping,the error range of the time is about 3 seconds per month.