URgreat Ultimate Essential Survival Rescue Tool Equipment Emergency Signal Sound Whistle For Outdoor Sports Camping Hiking Bushcraft Useful Lightweight, and with a keychain, easy to carry Use on life jackets, vests, foul weather gear, ring buoys, rafts, keychains, etc. Larger diameter, the whistle more ring, it is necessary supplies for outside help. Will not fade and longer life. 100% brand new.