Titan series waterproof injection molded case with foam insert 4 wireless mics and accessories. Designed to deliver the absolute best in protection with rigorous testing and certifications such as; ATA-300 impact test, ASTM D4169 - falling rain - vibration - drop tests, and Mil-STD-810F immersion test certified. Automatic pressure equalizing valve protects the case from creating a vacuum during altitude changes or atmospheric pressure differences by allowing air to pass through while preventing water from entering.