The DetectorPro Gray Ghost Deep Woods metal detector headphones are designed for the die-hard relic hunter, They have no exterior controls no exposed metal rainproofing cable strain reliefs and nothing to catch on branches, A special limiter circuit gives you a smooth reduction at excess volume levels and the compatibility and limiter switches are easily accessible on the inside of the cup where they are totally protected, Selector switch for metal detector compatibility without adapters, Selector switch for limiter, Special low-noise signal limiting circuitry protects your hearing from high volume hits without batteries, Heavy-duty muff-to-muff connection cable, Heavy-duty coiled cord with a special three conductor 1/4-in 90-degree angle stereo connector, Industrial grade Nylon 6/6 pigtail strain relief on cord termination, Compact carry and storage foldable design, Heavy-duty polymer muffs with full-ear surround soft comfortable cushions, Adjustable padded headband, Speaker elements are the ultimate in sensitivity efficiency durability and signal quality, Special sound-blocking muff design eliminating environmental ambient noise up to 24 decibels, Frequency response: 200 - 3200 Hz, Sensitivity: 72 dB @ 1kHz min, Impedance: 150 ohms nominal, SKU: DTTP002