The Motorola Protective Noise Canceling Earpads with PTT Microphone Cable, in OD Green, provide shooters maximum hearing protection, while allowing them to conveniently communicate with their instructor at the shooting range. They are also effective for communication while hunting in the field or between duck blinds without disturbing the game. Simply insert the PTT microphone assembly cable into the headset and use the PTT microphone located on the cord to communicate while the radio is secured on the clothing. With a Noise Reduction Rating of 21 dB, this earmuff will protect your hearing against harmful sounds. The MHP71 amplifies low-level sounds and uses suppression to provide a safe listening experience.