The first button to left at the top is for the watch to light up to view the Day and Time. The button below it gives you to a chance to set the Alarm on the watch, A stop watch, DT, TA. On the right side of the watch it gives you a chance to change it to the military time. Under that button is another button to light up the screen for the watch. The third button sets the time and date on the watch. The band of the watch is okay I just wished that when trying to fasten the watch that the buckle wouldn't slide out of the slot other than that it's a cool watch. I like the size of the time so it's not hard to see it.