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Technical Specifications:

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", 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... no screws, no wire frame, no rust!
Speakers designed for maximum sensitivity, efficiency, durability, and signal quality.
Special sound-blocking muff design eliminating environmental ambient noise up to 24 decibels.
Frequency response: 200 - 3200 Hz... only what your detector uses.
Sensitivity: 72 dB @ 1kHz min.
Impedance: 150 ohms nominal.
Backed by a limited lifetime warranty.