AmpliVox SB600R - Mini-Meg 10-Watt Megaphone - 10 W Amplifier - Battery, AC Supply - Battery Rechargeable - 20 Hour - Portable

Ultra lightweight at 2 lbs. Attached carrying strap up to 20 hours continuous talk time Folds for easily portability Requires 4 D-Cell batteries (not included) 10 Watts Effective Range: 100 yards Adjustable Volume Control Siren function