This product is just a tool, it takes practice to master the skills, and similar to whistling, each person's sound is unique. The bird whistle is magical, it goes on your mouth, it raises your voice an octave and lets you make awesome sound effects. Attach it to the tongue, with the crescent of the film facing outward. Let the whistle get soaked in your mouth. Once moist and soft, use your tongue to push into the palate. 1. -new magic, rich and diverse magic performances are extremely powerful, which can be used individually or integrated into the process; 2. Excellent workmanship, not easy to deform, beautiful in appearance. Specifications: Name: magic birdcall whistle Material: paper and metal Size:about 4.9*4.8cm/1.93*1.89in Weight: about 5g Package Included: 1 x magic birdcall whistle