Dimensions of the electronic whistle: 13.6 × 3.8 × 3.3 cm - Joker

Webpage (Electronic Whistle)
It is a battery-powered device that emits loud, distinctive sounds when a button is pressed.
, with features such as: loud sound (100–125 decibels),
Multiple tones (usually 3 tones) in response to different types,
A touchless design that's easy to use with one hand,
With the suspension, a new generation of coaches, referees, teachers, and emergency responders has emerged.