Inject water into it and whistle、 then the head of the dog whistle will spray water and give out bird call; Different whistling force、 different bird calls; Funny toy for kids. Dimensions: 2.80 in x 2.09 in x 1.38 in (7.1 cm x 5.3 cm x 3.5 cm) Weight: 1.38 oz (39 g)