Features Single rotary volume control with "stay put" segmented "click" positioning Selector switch for metal detector compatibility with all single-output metal detectors without adapters Heavy-duty muff-to-muff connection cable Heavy-duty coil cable with special 1/4-in, 90-degree angle stereo connector Compact carry and storage foldable design Heavy-duty polymer muffs with full-ear surround, soft comfortable cushions Adjustable padded headband Speakers designed for maximum sensitivity, efficiency, durability, and signal quality Special built-in signal limiting circuitry to protect hearing from high volume hits 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