Chens Men's Automatic Watch Gentlemen Series With Brown Leather Strap Band For the automatic watch which has not been dressed for over 48 hours,the knob shall be rotated for at least 20 rounds to start the driving system of the movement. This watchs crown can be pulled out into two sections.The first section is for setting date(towards to outside);the second section is for setting time(towards to inside). About how to set time:rotating the knob,the hour hand will run,at the time when the date jump to another day(it is 24 oclock or 0 oclock),you can set your time.If it is AM now,just set the right time;but if it is PM,please firstly just keep the hour hands rotating for a whole circle then set your pm time. Using Antireflective-sapphire Crystal dial window,more durable. With skeleton back.