IMPROVED DESIGN POWER AMPLIFIER & RANGE: The -MP-PRO 50-Watt Megaphone with Siren offers a range of approx. 500m (1,600 ft), works as an airhorn GREAT FOR OUTDOOR ACTIVITIES: Ideal for Football, Baseball, Hockey, Cheerleading Fans & Coaches, Referees, Safety Drills, Camping, Boating, schools, Siren for safety calls and getting everybody's attention FEATURES: Adjustable volume and recording/playback, Internal Memory Record (16 seconds), detachable microphone, repeat play back, led indicator, shoulder strap BATTERIES & WEIGHT: Rechargeable Battery included with Foldable Prongs to plug into the outlet to charge; also accepts 8 "C" batteries (not included) - The weight of the megaphone increases when (8) C batteries are used instead of the rechargeable battery. COMPATIBILITY & WARRANTY: USB, SD Card & AUX Jack for Playback, 110V. 1-year warranty.