WOLF Cortica Single Watch Winder in Cork Color with Cover 。Item No 668161 5.5\" L x 6.75\" W x 6\" H Patented Innovation - Every WOLF winder counts the precise number of rotations. All other winders estimate the number of rotations. Lock-in dynamic cuff: Patented lock-in dynamic cuff ‘locks’ your timepiece into the rotator drum for a secure fit. Low density foam to accommodate all wrist sizes without putting pressure on your bracelet. 1 winding module. Rotation: 10 second start delay, 900 TPD (Turns Per Day), patented rotation programs - Intermittent rotation with pause and sleep phases pre-programmed. Directional Settings: Bi-directional. Battery Option: Option to run the unit on AC power (universal adapter included) or AA batteries - alkaline or lithium (lithium batteries will last twice as long as alkaline batteries). Batteries not included. Material: Cork.