Used by U.S. Armed Forces - Ergonomic Pistol Grip and Light-Weight Chassis - Plug in MP3 Players or External Devices to the 3.5mm Aux-In Jack.For Indoor/Outdoor Use - Rechargeable Lithium Battery (Charger Included) - Dimensions: Diameter 9.44'' x Length 13.77''.Maximum Power Output: 50 Watt - Battery Powered by 8 x "C" Type Batteries, Not Included - 1,200 Yard Range.10 Seconds Integrated Audio Memory - 6 Audio Functions Including Talk, Siren & USB/SD Modes - Weight: 3.5 Lbs..Built-in SD & USB Flash Memory Card Readers - Comes with Lithium Rechargeable Battery - Lasts up to 16 Hours 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.