Additional Details ------------------------------ Bullet point: Radical redesign of the traditional method of waterproofing wired connections on Piezo transducers: All underwater headphones use a Piezo type "buzzer" speaker system because land use paper speakers would disintegrate after getting submerged. However, the tonality of the piezo system is unfortunately compromised due to the piezo being dampened with silicone to waterproof the connections... Actually degrading the "buzzing" action of the Piezo. Product description: Gray Ghost Amphibian II Headphone (pat.pend.) incorporates a number of dramatic improvements in weatherproof/submersible headphone design. It is designed to replace both the Garrett AT Pro land headphone and the Garrett after-market waterproof headphone. Now you can use one set of headphones for both land and underwater. The design is 100% waterproof and totally submersible to a minimum of 30 feet! No compromise in sound quality for functionality.