This is the TAG Heuer Monaco Automatic watch, model CW2113.FC6183. The Monaco line was first introduced in the 1960's.  This one has a blue dial and was made specially for Steve McQueen.  This watch, as with all automatic watches, has a power reserve.  The more the watch is worn, the more the reserve will fill.  The maximum reserve of this watch is about 40 hours.  This is how long the watch will keep working for once it is taken off.  If you are not planning on wearing a watch daily, it is best to purchase a quartz (battery operated) watch.  You may also purchase a watch winder, which will keep the reserve full.  This watch also comes with a blue crocodile strap with a deployment buckle.  It is easy to put on and take off.