25 Watt Piezo Dynamic Megaphone with Detachable Coil Cord Mic 25 Watt Piezo Dynamic Megaphone with detachable mic 3 Modes: Talk, Siren, Whistle Adjustable Volume Effective range: up to 1 mile (1760 yards) Uses 8 C cell batteries (not included) for up to 40 hours continuous use