Vivotek WFD User Manual page 23

Streaming Options – For users to select the video streaming types. Select
"Streaming Video" options, the video connection will keep alive to enable you to see
smooth video, while "Single JPEG" options will let you see the video in JPEG format
by client periodic update the JPEG image from server according to the "Frame rate"
settings.
Talk Button Control Style – For the User to determine whether to "click once and
talk" or "push to talk".
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