With each iteration of flagship megaphones, we've improved the battery life, power and ergonomics. This model has 50 watts of power, so your voice will have a range of 1200 yards. Comes equipped with 10 second integrated audio memory, built-in SD & USB flash memory card readers, rechargeable lithium battery with charger and the 3.5mm Aux-In jack allows you to connect and play your MP3, smartphone or other external device and stream audio directly through the megaphone. Stream your favorite audio file directly through the megaphone. Works great indoors and outdoors.