The Acme Model # 901 Helluva Whistle is a lightweight orange plastic safety horn designed for outdoor activities such as hunting, camping, and hiking. With a loud decibel output of 120 dB, this whistle is perfect for signaling for help in emergencies. Made by Acme Whistles in the UK, this unit is compact with dimensions of 2.75 inches in length and 0.5 inches in width, making it easy to carry around for any outdoor adventure.