Project crystal clear sound from up to 800 yards thanks to advanced engineering and built-in amplifier Rugged, drop-tested, megaphone holds up to heavy use thanks to ultra-durable resin housing Fully waterproof with specially housed electronics to avoid corrosion - and floats if dropped in water! Cost-saving rechargeable battery is protected with twist-in lock to protect batteries from moisture Ergonomic design is lightweight and easy to hold