Inject water into it and whistle、 then the head of the bird whistle will spray water and give out bird call; Different whistling force、 different bird calls; Funny toy for kids. Dimensions: 2.83 in x 2.20 in x 1.61 in (7.2 cm x 5.6 cm x 4.1 cm) Weight: 1.20 oz (34 g)