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 sound-blocking muff design eliminating environmental ambient noise up to 20 decibels Frequency Response: 150 Hz - 20 kHz Impedance: 16 ohms nominal Backed by a limited lifetime manufacturer warranty