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When in emergencies, please blow it immediately. A science whistle that produces sounds near 3200 Hz, which is said to be the most easy to hear in peoples ears. When you call it loud for a while, you will get tired and your voice will wither. With Help~, you will be more likely to notice people around you as it produces a sound that is easy to reach to peoples ears even when you blow. Small but dependable! Help ~ is very tough. Even your little one can handle it with a little rough rough. Since there is no need to worry about running out of battery or failure, it can also be used as a replacement for security buzzers. In addition, the strap is designed to detach when pulled, so there is no need to worry about wring your neck in the event of an emergency. In consideration of metal allergies, we use a string that is not made of metal.