- Standard choice referees and coaches at all levels, rescue professionals and general safety worldwide
- No moving parts to freeze, jam or deteriorate
- Flawless, consistent and reliable
- Will be heard above ambient noise, loud crowds, the roar of engines, breaking waves and thundering gale-force winds
- Chambers are designed to self-clear when submerged in water
- Sound will be heard up to a mile away
- Design: 3-chamber pealess