Firekingdom Metal Mechanical Metronome with large Movement,Transparent Yellow Material: Alloy & Plastic;Color: Transparent Yellow Dimensions: (11.5 x 11.3 x 21)cm (L x W x H) No batteries are needed and a moderate winding up is advised Among all metal metronomes with large movements, it has a higher accuracy Package Includes: 1 x Metronome ,1 x Clean Cloth, 1 x User Manual