WOLF Watch Accessory(Model: 452503) Synthetic Leather 1 winding module, glass cover and lock in cuff Patented Innovation - Every WOLF winder counts the precise number of rotations. All other winder estimate the number of rotations. Pre-programmed - 900 turns per day. Directional Settings: Clockwise, Anticlockwise and Bi-directional Battery or Power Option with Universal Power adapator 2 year Manufacturer warranty worldwide