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.