Virtually indestructible, these rugged cases have innovative features for unmatched strength and durability. Each case is O-ring sealed and waterproof up to a depth of 3 feet, airtight, and built to withstand the most extreme transport conditions. The new TELEFUNKEN cases are ideal for airline travel, complete with an automatic pressure equalization valve. They include spring release latches that lock in place as well as lock holders for use with padlocks for added security. Inside the cases, customized foam offers an extremely tailored, custom fit for the AR-51, AK-47 MkII, CU-29 or ELA M 260 microphone systems.