Amplivox SB601R Mity-Meg 15-Watt Megaphone with Rechargeable Battery 15 Watt Piezo Dynamic Megaphone 3 Modes: Talk, Siren, Whistle Effective range: up to 5/8 mile (900 yards) Power with included Rechargeable Lithium-ion Battery Pack, or 8 AA cell batteries (not included). Battery indicator :low, medium, high Effective Range: 900 Yards Battery Indicator Lights Shows Power Status 3 Modes: Talk/siren/whistle Adjustable Volume Easy To Use Battery Cartridge