Amazon.com: 5 CORE Mini Megaphone w/Rechargeable Battery Bullhorn Speaker Megaphono 400 Yard Range -Siren +Adjustable Volume Control Kids or Adults for Cheerleading, Football, Soccer, Party : Sports & Outdoors
Rechargeable Lithium-ion Battery Pack for Megaphone for AMP03/AMP04 | Emedco
Kemp USA 10W Battery-Operated Megaphone 10-432 - 3/16 Mi. Range
Mity-Meg 25-Watt Megaphone - up to 1 mile sound coverage
50 Watt Battery Volume Adjustable Megaphone 1,700 Yard Range
Pyle Battery-Operated Compact and Portable Megaphone Speaker with Siren Alarm Mode (Blue) at Lowes.com