SainSmart DIY-DS1302-Rotating-LED-Electronic-Digital-Clock-Kit-51-SCM-Learning-Board-5V-xp PLUS key, for years, months, days, hours, minutes, seconds add operation According to the numerical sum 1 at a time MODE key, can be in display clock, switch to the year, month, day, hours, minutes, alarm clock, the adjustment of outer ring LED display state To use add key to the year, month, day, hours, minutes, seconds, and display mode to adjust RST key, press the reset button, then the MCU reset