MTS2000 Noise-Canceling Headset with Boom Microphone, Tactical Hardhat Mount Headset, Grey; Noise Reduction Rating of 22dB—Requires Adapter Cable. Ideal for two-way communication in extremely noisy environments. Dual-muff tactical headsets include two microphones on the outside of the earcups which reproduce the ambient sound back into the headset. Harmful sounds are suppressed to a safe level and low sounds are amplified up to 5 times the original level, but never more than 82dB. Includes on/off volume control on earcups and 3-foot coiled cord. Easily replaceable earseals are filled with liquid and foam combination to provide excellent sealing and comfort. Requires separate in-line PTT adapter cable. Hardhat not included. Requires separate in line PTT adapter cable RKN4094, RKN4095 and RKN4097. THIS ITEM IS INTRINSICALLY SAFE ONLY WITH FOLLOWING RADIOS: HT750, PRO5150, HT1250, PRO7150, HT1250•LS, HT1250•LS+, HT1550•XLS, PRO9150