Digital calendar clock, 1. Digital display: seconds, minutes, hours (can be displayed simultaneously, can also be rotated to display) 2. Be able to set the time, " Setting button" limited quantity, with a simple and reasonable to use as well. 3. Error: 1 second/day (to be discussed in the report meets the requirements analysis) extension 1. Set the calibration key: When the digital clock is displayed when " the whole point of 30 seconds," range, press " Calibrate button" , the digital clock is adjusted to the whole point instantly, eliminating the 30 seconds of errors. 2. Plus " week" shows (can be preset), and can be set up.

clock

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