AVer IWH5000 series - Manual (Page 49)

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Name Function
(21) Volume Adjust the audio volume to a proper volume.
(22) On Screen Keyboard If the keyboard is not available, you may use the Virtual
Keyboard.
(23) De-interlace
To enhance the video quality. Set the de-interlace mode to #1, if
you are capturing motionless picture and #2, if it captures lots of
movement.
(24) Turbo
To improve the smoothness of live video. Turbo button is
disabled（ ） in default. When turbo button is enabled or
disabled that applies to whole DVR system, not the specific
channel. When restart or shutdown DVR system, the current
turbo status won’t be saved by DVR system