Leather-covered structure. It is sufficient to apply a slight pressure to detach the rotating part, which is provided with a watch strap extender. It works with 2 aa batteries. Multiple rotation settings: clockwise, counterclockwise or alternating. Chronos operates on a basis of gentle rotation, ensuring a consistent movement over a longer period of time that won’t over-wind one’s watch. Size: 18 x 12 cm – h. 12. 5 cm