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Pyle PMP40 40W Mini Megaphone with Siren$22.12
Boost the volume of your voice. The handheld megaphone uses 40 watts of peak power, allowing you to be heard up to 1,000 yards away. This megaphone bullhorn comes with an adjustable volume control and has a siren for emergency situations.
Its tough ABS housing ensures reliability even in harsh outdoor conditions. Size: 8" diameter x 13.13" length.