WOLF 4524029 Windsor Single Watch Winder, Black 1 winding module with 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 Enlarged drum (71 mm deep and 77 mm wide) - easily holds the largest of timepieces with a patent pending "lock in" cuff The watch cuff has been designed to fit bigger and heavier watches (up to 52mm case). 900 turns per day with rotation options for clockwise, counter-clockwise, or bi-directional Runs on 3.3V (110/220V) adapter or D-cell batteries (lithium or alkaline). 10 second start delay. Patented rotation programs- intermittent rotation with pause and sleep phases pre-programmed Black pebble finish exterior, silver silk faceplate and silver chrome dial