The DetectorPro Gray Ghost Underwater metal detector headphones are designed for all underwater or wet applications, User-selectable impedances allow compatibility with all underwater detectors and commercial diving equipment, Solid-state speakers leave sound quality unaffected by depth, User-selectable impedance for compatibility with all water detectors, Heavy-duty muff-to-muff connection cable, Heavy-duty coil cable li>Compact carry and storage foldable design, Heavy-duty polymer muffs with full-ear surround soft comfortable cushions, Adjustable padded headband, Solid state speakers designed for maximum sensitivity efficiency durability and signal quality wet or dry and regardless of depth, Special sound-blocking muff design eliminating environmental ambient noise up to 24 decibels, Frequency response: 200 - 3200 Hz, This product no longer has a bulkhead connector, SKU: DTTP005