Product Description Material: ABS Size: 6.3 * 3 cm Function: high decibel survival whistle, north (south) needle, thermometer, nylon lanyard Nylon rope factory: 40 cm Color: Army Green Quantity: 3 Package Contents: 3*3 in 1 whistle 3 IN 1 MULTIFUNCTIONAL In addition to the emergency whistle, it is also a compass and thermometer, bringing you essential information for outdoor sports. Neck Strap You can use your favorite lanyard instead of the nylon lanyard. Bring any burden to your outdoor activities, the neck lanyard is easily available in any situation, it can also be attached to your backpack, belt, etc. good results. Widely used for camping, hiking, biking, skiing, any outdoor activities, and also for coaching, coaching, sports, teachers, lifeguards, protection, self-defense. Loud sound does not hurt your ears If there is an emergency on the water, a whistle can save your life. The reason is that if you fall into the water, it's really hard to scream, and besides, the screeching of the sound is really not that loud. Whistlesare much louder than screams, so you have to whistle when you are on the water. This is the tone you are looking for. The sound is good and the distance is great, it won't hurt your ears when blowing Durable and loud with just the right tone and vibrato to command authority. In very cold weather, the balls inside can freeze. If this happens to you, try spraying some dry silicone on the inside to coat the ball. I would expect this to be common to mostwhistles of this type and easy to hear - 3 super loud survival whistles provide up to 120 decibels of sound guaranteed to be heard from a distance and useful in an emergency