Heil Sound Original PRO7 Black Industrial Headset with Dynamic Microphone, HC-7 Mic Element The most comfortable wearing headset - ever. Adjustable stainless headband. Special designed foam gel ear pads provide 26 dB PNR reduction of outside noise Cotton cloth "booties" to cover ear pads 40 mil high response speakers producing extreme voice articulation Acoustically tuned speaker enclosure -3 dB points set at 80Hz to 12kHz Speaker balance control adjusts level between the two speakers Full stereo, two channel reception. Perfect for Dual Watch receiving systems Military spec cable system using 6 pin mini-XLR and fiber reinforced cable Connects to standard Heil headphone adapters Detachable coil cable with comfortable "Soft Touch" in line, 2" diameter P.T.T. 1" thick, 6 section foam headband for maximum comfort Interchangeable microphone element. HC 7 articulate dynamic OR Heil electret iC condenser Heil EXCLUSIVE Speaker Phase reversal helps to "dig out" the weak signals