Features Dual 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 strain relieved 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 volume, sensitivity, efficiency, durability, and signal quality Special ultra sound-blocking extended muff design eliminating environmental ambient noise up to 29 decibels Frequency Response: 200 - 3200 Hz Sensitivity: 72 db @ 1 KHz Min Impedance: 150 ohms nominal Backed by a limited lifetime manufacturer warranty