Every geek knows there are 10 kinds of people. For those who understand this joke, there’s this binary clock. Rather than boring digits, this clock uses binary code for displaying time. It’s available with red or blue leds, can display time in 12 or 24 hour mode and you can select true binary or BCD (binary coded decimal) numbers.
Perhaps a short explanation for that. True binary means the full number is converted to binary, so 35 becomes 100011. In BCD, every single digit is converted to binary; in that case 35 becomes 11 101. The clock requires 3 AA batteries (not included)
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