RODE Microphones Stereo VideoMic X - Manual (Page 11)

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General operation
High-pass filter switch
The high-pass filter (HPF) is a low frequency cut-off setting, which
you can use to reduce rumble and other low frequency noise picked
up by the microphone while recording.
Diagram 7 - High pass filter switch control button
For instance, it may be helpful to engage the high-pass filter to cut
out the sound of air conditioning, handling noise while adjusting
focus settings and distant traffic audible in the background.
To engage the high-pass filter, press the center button on the back
of the microphone. The Stereo VideoMic X will cycle through each
setting as the button is pressed, and the green LED will indicate the
position that is currently selected.
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