SED® lightweight noise attenuating earcups provide consistent, comfortable protection and superior sound quality. Dual receivers provide a crisp audio response. The microphone preamplifier operates over a voltage range of 4V to 24V and a load range of 100K Ohms. An adjustable behind- the-head steel tension band and two fully adjustable velcro straps provide day long wearing comfort and a secure fit even under a hardhat or helmet. Replaceable soft foam ear pads ensure a longer life span of the headset. The bright yellow earcups increase visibility. With preaplified electret boom mic, volume control, PTM button, nexus connector and 2' cord (Designed specifically for ARVIS Communication System).