The Karrimor Mountain Whistle is an essential safety item in case of emergencies during outdoor activities and treks and is easily attached to your gear with a keychain loop Please note: We are unable to guarantee which color you may receive. Mountain whistle. 108 decibels . Keyring attachment . Tough anodized aluminum . Imported. . NOTE: This product is sold in U.S. sizes. While the physical product may display both the U.S. & U.K. sizes on it, please place your order using the U.S. size.