Dual-tone Bird Whistle – fill, blow, 2 calls

A dual-tone bird whistle; add water and blow, and two birds will sing in unison. Dry blow: Blow without water, and it's a loud whistle. Add some water and blow again— two different bird calls sound simultaneously, clear and interwoven, as if two real birds are singing a duet in your ear. What's more, different water levels will change the bird's song. Try blowing with different amounts of water; the calls will vary, offering a new surprise each time. ⚠️ Tip: Experiment with different water levels a few times to find the "recipe" that sounds most like a real bird. Principle: dual-chamber structure, water creates different frequency trills inside the chambers Keychain design: hang it on a backpack or with keys, carry it with you to blow anytime Print in Place, no supports   Multiple sizes available: Large, medium, and small are available, both with and without hanging holes.   Dimensions: Large: 85.5*44*61 Medium: 72*37*51 Small: 57*29.5*41 Comparison chart below:   Boost MeIf you like it and find it helpful, please boost me ❤️! Your support is a great motivation for my creation! 🙏🙏🙏