Wireless Half-Mile Hailer Kit includes the SW610A Wireless Half-Mile Hailer plus an extra horn speaker, two tripods, and a rugged carrying case on wheels with luggage handle. Powerful PA reverberant horn delivers 108dB sound pressure level over the 450Hz - 4kHz audio range. Your audience can hear loud and clear while you direct the action! Great for athletic events, band practice, field days, public safety, law enforcement, outdoor marketing events, crowd control auctioneers political campaigns missionaries - any outdoor event.