Dual power supply: powered by 100-240v AC adapter (included) or battery (not included). Since it can be used with batteries， you can display and wind up anywhere without worrying about power cords and extension cords. Wide compatibility: This watch winder can hold 4 watches and store 6 additional watches. The flexible pillow can support watches of various sizes， which fully meets your expectations. Rotation modes and functions: The watch winder can rotate clockwise， counterclockwise and alternately. Five rotation modes are available for selection. The time is automatically calibrated for you to extend the life of the watch. Noise isolation: The upgraded motor can effectively reduce the noise as low as 10 decibels， the operation is quiet and safe， and no noise.