Half-Mile Hailer. Powerful 50 watt PA reverberant horn delivers 108dB sound pressure level over the 450Hz - 4kHz audio range. Reach crowds up to 3000. Covers the length of a football field! Lets you see and be seen. Great for athletic events, band practice, field days, public safety, law enforcement, outdoor marketing events crowd control, auctioneers, political campaigns, missionaries - any outdoor event. Includes powerful 50 watt multimedia stereo amplifier and dynamic mic with 5 foot coiled cord; shoulder strap. Power with 10 D-cell alkaline batteries (not included) for up to 200 hours; S1460 International AC Adapter/recharger; or S1465 Rechargeable Nicad Battery Pack (requires S1460). S1940 Half-Mile Hailer carrying case available.