Because nothing says as much about a person as a fine automatic watch, at Tourneau they have invested countless hours developing the ultimate way to keep your watch ticking while it’s not on your wrist. European craftsmanship and patented technologies stand behind all of Tourneau's watch winders. This Tourneau Single 2.5 Winder features a pebble finish exterior, silk fabric faceplate and polished chrome control panel. The "lock" in cuff accommodates a wrist size in excess of 10 inches.  This winder runs on a 3.3V (110/220V) adapter (included) or D-cell batteries.