The All New Sparta with Lithium Batteries! This budget priced winder is finished with Brown grained faux leather. The mounting cup and cushions can be easily removed to take a watch on or off. Factory fitted with 4 Lithium "D" batteries which provide a minimum of 5 years guaranteed operating life at the normal 10-minute winding cycle. Even longer life may be accomplished using the 15-minute mode, depending upon the watch's winding characteristics.