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"> Product Name: Dual frequency High pitched Whistle Material Science: ABS Origin: China Packaging: Single transparent PP bag packaging Color: khaki brown military green black orange (please specify the required color when placing an order, if not specified, the warehouse will ship randomly) Product size: Length 7.2cm X Width 2cm Product weight: 10 grams The new outdoor rescue whistle features excellent quality and can be hung on a backpack with a rope or fastened to any desired strap on the backpack. It is an essential equipment for outdoor sports for backpackers At critical moments, even small things have great potential. A good bag must have accessories to match it The store has been tested and found to have outstanding performance. Highly recommended 1. Dual frequency design. The different sized sound chambers on both sides produce high and low frequency sounds simultaneously, ensuring excellent penetration in different environments and conditions. 2. Whistle anti slip design. You don't need to hold it with your hands, and you don't have to worry about the whistle being blown out by the airflow. It's made of non-metallic material, which also avoids damage to the mouth and teeth. 3. It's effortless to make a sound. When seeking survival or assistance, one must pay attention to conserving energy, and a good survival whistle must be able to sound easily. Some products on the market may sound loud, but they are not easy to produce sound. 4. Integrated design, sturdy and reliable. 5. With a back clip, it can be easily clipped onto clothes or bags, and the tail hole can also be used to thread ropes, necklaces, keychains, etc. When traveling outdoors, we can help you confirm your location, avoid getting lost, find companions, and provide assistance. If you want to have an ideal outdoor trip, don't forget to prepare carefully before departure Don't forget to check if you have brought your whistle before departure Guidelines for the use of survival sentries [repost] A survival whistle doesn't necessarily have to be used in times of danger, such as saying hello to those in front or behind, determining how far apart they are, determining the direction of the other person's voice source, and so on..... However, there is a problem here, which is that sometimes when climbing a mountain, everyone just starts blowing their whistle. After blowing too much, everyone doesn't feel anything anymore, and they don't want to hear others blowing anymore. They just go their own way. At this time, if someone's foot twists, or if they need help somewhere, or if a new donkey that has been pulled far in the middle encounters a crossroads and doesn't know how to go, it is very urgent that no one responds when blowing the whistle, because others think nothing has happened, and they are busy silently grinding and don't have much time to deal with it, just like a wolf coming Symbol description: ● Short note (within one second); ■■■ Long notes (over 3 seconds); The interval between whistle sounds within instructions is 2-3 seconds, and the interval between instructions is more than 30 seconds (for example, repeating instructions requires an interval of more than 30 seconds) Communication (T): ■■■ (one long tone) is used for team voice communication to determine the direction of the whistle between each other. After receiving the whistle command, it sends out a representative of receiving the command (similar to shouting 'hello~~~~') Set (U): ●●■■■ (two short and one long) Set in the direction of the whistle sound (similar to the shouting set) Forward (V): ●■■■ (one short and one long) When resting, it represents the departure of the whole team, and when moving forward, it represents acceleration（ Let's shout and shout together~~~~Similar) Front team waiting (W): ●■■■■■■ (one short and two long) Used when the distance traveled by the team is too long, requiring the front team to wait for the back team (similar to shouting 'please wait~~~~') Request for Support (S): ●●● (Three Short) When encountering difficulties and seeking help, the signal is sent out, and the recipient replies with a communication tone (T) indicating that they will go to support (similar to shouting urgently) SOS: ●●●■■■■■■■■■■●● (Three Short, Three Long, and Three Short) This is the internationally recognized SOS code, please memorize it