AMPLIVOX SW610A Half-Mile Hailer (Wireless)

Reaches audiences up to 3,000ft; Covers the length of a football field; Weatherproof, reverberate horn speaker; Delivers 108dB sound pressure level over the 450Hz-4kHz audio range; 50W wireless multimedia stereo amp with built-in receiver; 3 microphone inputs; Shoulder strap; Emergency siren button; Rechargeable S1465 NiCd battery pack (requires S1460); Powered with optional S1460 AC adapter; Up to 200 hours battery life; Requires 10 D alkaline batteries; Wireless; Includes lapel & headset microphone with transmitter;