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 coil cable available with special 1/4-in, 90-degree angle or straight stereo connector Compact carry and storage foldable design Heavy-duty polymer muff with full-ear surround, soft comfortable cushion Adjustable padded headband Speaker designed for maximum sensitivity, efficiency, durability, and signal quality Special sound-blocking muff design eliminating environmental ambient noise up to 24 decibels in one ear only Frequency Response: 200 - 3200 Hz Sensitivity: 72 dB @ 1kHz min Impedance: 150 ohms nominal Backed by a limited lifetime manufacturer warranty