These watches all feature a Power Reserve Indicator, one of the most important complications besides the actual time display for any mechanical or automatic watch. The indicator indicates the amount of tension on the mainspring, effectively showing you how much time is remaining for the watch to function before it must be worn or wound again. All of our Power Reserve watches are fully automatic, so winding is not necessary, your daily wrist movement will be enough to wind the watch. All of our watches have a 48 hour Power Reserve.