Just a push of a button provides a loud, clear and consistent sound! Hygienic alternative to mouth blown whistle. Battery and lanyard included 100dB of loud crisp sound good for sports and safety Instead of being mouth-operated, the Electronic Whistle utilizes a push button, which offers a hygienic solution for multiple operators 4-switch, three tone functions – Off / Tone 1 / Tone 2 / Tone 3 Sound can be aimed in specific directions to maximize effectiveness