Mechanical watch, though somewhat thick female, but all are mechanical watches. goes back through the push button and / or wrist movements (I do the door the day not at night), ideal for those wishing to watch without having to worry about changing the battery. No instruction manual supplied with the watch, but it is easy to use, pull the button (2 steps) to set the hour, turn the knob bottom position backward to the back (about 1 turn per hour in my personal experience). I did not go back during the day as it goes alone with my movements. Perfect.