The Ultrak Four-Tone Electronic Whistle (model EW4) is a handheld device that produces four distinct sound effects at three different volume levels, including a maximum of 130 dB. It features a built-in LED light, a detachable wrist strap, and one-button operation, making it a hygienic, mask-friendly alternative to traditional whistles for coaches, referees, and other professionals. The whistle is powered by an included 9-volt battery.