The internal parts of automatic watches are designed to follow the pull of gravity. Therefore, they don't have gears that must be wound with a spring. Instead, their tiny weights get pulled by gravity as you move and swing your arm, so little by little these weights are twisting around both clockwise and counter-clockwise, until your watch is wound up.
Capacity: 5 Watches
Input: 100-240V AC
Output: 3V 1.2A
Plug: US Plug (we will send you the suitable adapter according to your location)