Three, two, one. The half mile hailer is a signature AmpliVox PA system that lives up to its name and can be heard up to a half mile away. This can cover an audience size of up to 5,000 and an area of up to 50,000 square feet. The system is easy to use and operate. Just turn it on, plug in the bike, and you have sound. The 10D cell batteries last up to 200 hours. The half mile hailer is made in the USA and comes with a six year warranty. The older versions of the hailer have been known to last 25 years over four times the length of their warranty. The hailer is a favorite among race officials, police and fire departments, emergency professionals, street preachers, lifeguards, youth sports coaches, firing range masters, and auctioneers. The hailer has helped police and SWAT team members negotiate during a hostage situation. The nearest feature on the hailer is a volume of just little siren. For more information on the half mile hailer, please go to ampere.com or give us a call. AmpliVox, extend your voice.