The watch has China Movement ,, i'ts a mechanical watch ... The most important feature of a mechanical movement is the mainspring that must be manually wound to store potential energy. This spring unwinds slowly, releasing energy to move the gears that power the watch's timekeeping functions. Reflecting the skill of talented watchmakers, mechanical watches have an intricate composite of gears and springs and are crafted just as their predecessors were before the age of battery power, so in other words you don't need a battery ..