Special sound-blocking muff design eliminates environmental ambient noise up to 24 decibels so you dont lose focus on the target. And they wont fall off or leave your ears in pain either. the heavy-duty polymer muffs have soft comfy cushions. Adjustable headband has no screws or wire frame so it cant rust! Best of all it has a compact foldable design for easy storage. 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 with special 1/4 90-degree angle stereo connector. Full-ear surround sound. Special built-in signal limiting circuitry to protect hearing from high volume hits. Frequency response: 200-3200 Hz. Sensitivity: 72 dB @ 1 kHz min. Impedance: 150 ohms nominal.