Dual Power Source Automatic Watch Winder by Swiss Watch International

A watch winder is a must-have accessory for anyone that doesn't wear their automatic watch every day or for those with multiple automatic watches in their collection. Automatic watches operate using a self-winding mechanism which utilizes a moving weight within the watch case. The natural movement of the wearer's wrist causes the weight to spin and the spring to be wound. Typically, when not worn for over a day, the power stored is depleted and the watch stops... which, of course, means you'll need to reset the time the next time you want to wear it.