Kestrel Blue Ocean Megaphone 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 Rechargeable battery Battery charging station Detachable carry strap Protective bumper Waterproof &amp; tested to IP-67 MIL standards Twist-In Battery Lock to Block Out Moisture Drop-Proof, Impact-Resistant construction Ultra Durable Resin Housing