The Radians R-3400EQCS, manufactured by Radians Inc., is an advanced electronic sound amplification earmuff. This product features the innovative Quad Mic technology from Radians, which utilizes four independent microphones to deliver a comprehensive and immersive surround sound experience.The R-3400 is exceedingly proficient in amping up low level noises, yet showcases the ability to compress sounds that surpass safe levels. With its compact design, the earmuffs conveniently fold for effortless storage. It\'s also compatible with most smart devices through the use of a 3.5mm stereo input jack and patch cable.