The ultimate, the one, the only. 4.1 is the solution to the dilemma, “how many winders?” You own one watch no problem, you have three, we can take care of that. Once you buy another watch, buy another 4.1 winder. They connect and are powered together. Build your own watch winder tower, be creative! SIZE:  4.75" L X 6" W X 6.25" H FEATURES 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. Rotation options: 10 second start delay. Can be set between 300 and 1,200 TPD (turns per day). Double the amount of TPD by selecting bi-directional setting Directional settings: Clockwise, counter clockwise and bi-directional Power reserve setting: 6 to 72 hours in increments of 6 hours power reserve setting to accommodate watches with a power reserve, giving the watch time to release stored energy before the winding program begins.  Power Options: AC power (universal adapter included. One adapter can power up to 12 modules). Other: 1 bridal cable, 1 connector joint, glass cover and backlit LCD display Storage: 1 winding module  Material: Plastic