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A megaphone, speaking-trumpet, bullhorn, blowhorn, or loudhailer is usually a portable or hand-held, cone-shaped acoustic horn used to amplify a person's voice or other sounds and direct it in a given direction. ... It also serves to direct the sound waves in the direction the horn is pointing. Perfect for announcements in colleges , schools, drills , offices , police , including siren noise You can record music, voice and play subsequently it has 240 seconds recording capacity Also, you can playback from bluetooth, USB or memory card recorded voice , speech ,anthems, music and so on USB Chargeable , cable provided. Battery can be recharged -recharge unit provided , 1 battery included 50 watts sound output suitable for large audience. Handle for grip with mini sling . Continuous repeat playback available. Announce , Signal and Siren!