Cases Titan Series GM-04-WMIC-WP Case offers military grade, unstoppable protection and security for up to four (4) wireless microphones. The built-in, shock absorbing foam nest neatly stores four (4) wireless microphones, body packs, headsets and additional accessories. Thick padding in the lid provides added protection and holds all of the equipment in place during transport. The sleek, black cases are injection molded from a high-impact, crush-proof, lightweight NK-7 Resin and features s UltraGuard Technology making it water-proof, impact-proof and dust-proof. An 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 to keep your microphones dry and intact.