Wireless Half-Mile Hailer Kit with Handheld Wireless Mic. Reach crowds up to 5000. Covers the length of a football field. Includes SW615 and ADDS extra horn speaker, 2 tripods and carrying case on wheels. Powerful 50 watt PA reverberant horn delivers 108dB sound pressure level over the 584-608MHz audio range. 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. Power with optional S1460 AC adapter, 10 D-cell alkaline batteries (not included) for up to 200 hours, or S1465 Rechargeable NiCad Battery Pack (requires S1460 AC adapter).