Features 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 Backed by a limited lifetime manufacturer warranty