1: Whistling, as an ancient and portable sound-producing tool, has occupied a unique position in human history with its simple structure and powerful functionality. Traditional whistles typically consist of a shell, air passage, and diaphragm, producing high-frequency vibrations through the impact of airflow on specific structures, thereby emitting clear and sharp sounds.

2: Classified by construction, whistles can be divided into blade type and cavity type. Blade whistle uses airflow to drive internal blades vibrating for sound production, resulting in crisp and loud tones; cavity whistle produces sound through resonance within a closed chamber, offering a broader range of pitches. In terms of usage, whistles are widely applied in various scenarios of life, such as refereeing during sports events, distress signals in wilderness exploration, and musical performances for entertainment. Due to their convenience and rapid sound production, they have become indispensable practical items.

3: Industry experts point out that the application of ultrasonic welding technology not only enhances the durability and functionality of whistles but also drives the industrial upgrading of portable sound-producing tools. With the popularization of this technology, future whistle products are expected to find wider applications in professional fields (such as aviation and naval navigation, military command) and civilian markets (such as children's toys, fitness training). "Ultrasonic welding has elevated the quality ceiling of whistles, and we believe this will usher in a new era for portable sound-producing tools," said the brand representative.