The CC-40 headset is specifically designed to enhance the performance of virtually any intercom or communications system, especially for Clear-Com Party Line, PL-Pro, Matrix Plus II and Matrix Plus 3 intercoms. They are especially appropriate for use in inter-communications applications where value and sound quality are of prime importance. The acoustical isolation of the earphone allows for low ear fatigue in high noise environments through the use of highly-attenuating, form-fitting ear cushions. The dynamic microphones features excellent noise cancelling capabilities with wide frequency response and superb resistance to breath and wind noises. The boom mic can be adjusted to any position as a right- or left-hand headset. In addition, the boom can be bent into any required position. The earphones have specially contoured wide-bandwidth frequency response and a sensitivity that will produce an SPL of 112dB with only 1mW of power.