The MPH50USB is a high powered megaphone great for any occasion. For convenience, it features a wired microphone that can be attached to the back of the MPH50USB and activated via the trigger controls or detached and activated via integrated controls on the microphone itself. The MPH50USB also comes with a built in siren and internal memory that allows you to record messages and play them on a loop. All of this is backed up by the MPH50USBs high peak power output of 75 watts which helps cover larger areas. In addition to its microphone, the MPH50USB also sports USB, SD and AUX inputs that allow you to play recorded messages and even music from smartphones, music storage devices and more. For extended playback time, the MPH50USB operates on 8 C batteries or the rechargeable ER66Battery (sold separately) that gives you hours of use. Features: Great for making announcements at sporting events, parties, and other large venues High powered bullhorn loudspeaker that helps your announcements go farther A wide variety of inputs that helps you get the most out of this loudspeaker Looping capabilities that enable you to play recorded messages Detachable, handheld mic gives you additional freedom Peak Power: 75 Watts Input: USB/SD card, Aux 3.5mm Up to 5 Hours of continuous use Battery: 8C batteries (not included) or rechargeable battery Anti-feedback Microphone 800M-1000M Range ABS construction and ergonomic pistol grip Handheld or shoulder strap (included) Playback features with playback controls Built in recording memory allows for recording 16 seconds of looped playback Police Siren Volume Control Microphone can be used with trigger button or set continuously on with Microphone switch Speaker Sensitivity SPL(F0):903dB 0.1W at0.9k/1.0k/1.2k/1.5k average Dimensions (L x W x H):9.1"x 5.5" x 14"