With the original purpose behind paracord bracelets being to survive a situation in the wild, the whistle buckle is an obvious edition to any survival bracelet. Available in both black or safety orange the side release whistle buckle works with any paracord bracelet, lanyard, belt, and any other paracord products. The buckle is made with the whistle as part of it, so there is no chance of losing the whistle while you are out hunting, camping, hiking, or just exploring.***The universal call for help is always in a set of three. If you get into a situation where you need to use your whistle buckle as a help signal, give it three short blasts, pause, and repeat.***