This ATT-448 from Hosa is a switchable input attenuator for stepping-down an input level to a mixer when that level is too high. For instance, a hot microphone in front of a loud source will "peg the meters" at the board and cause audio distortion.
The ATT-448 attenuator is placed in-line between the microphone and the board and the appropriate amount of attenuation switched in. The choices are 20, 30, or 40dB of signal reduction, for a wide range of uses on stage and in the studio.
The unit accepts the appropriate male and female XLR connector.