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. Underwater-pluggable bulkhead connector is standard. User-selectable impedance for compatibility with all water detectors. Heavy-duty muff-to-muff connection cable. Heavy-duty coil cable with underwater bulkhead connector. 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.