Features: Built-in Microphone, Dynamic Microphone and High-Quality Speaker, Compact, Portable, and Durable, Built-in Automatic Siren Function, Adjustable Volume Control, Talk, and Siren Switch, Ergonomic Pistol Grip and Light-Weight Chassis, Trusted & Used by U.S. Armed Forces, For Indoor/Outdoor Use, What's in the Box: Megaphone Speaker, Technical Specs: Construction Material: ABS, Power Output:15 Watt MAX, Audio Projection Range: 600'+ ft., Bell Width: 3.86'' -inches, Battery Operated, requires: (6) x 'AA' Batteries, Not Included, Megaphone Size (D x L): 3.86'' x 6.10'' -inches