Sony UWP-D27 2-Person Camera-Mount Wireless Omni Lavalier Microphone System (UC90: 941 to 960 MHz) - Manual (Page 26)

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Control dial 6.
For shooting: AF-ON (AF On) button
[Tracking On + AF On] is assigned in the default settings.
For viewing:
(Enlarge) button
7.
For shooting: Fn (Function) button
For viewing:
(Send to Smartphone) button
You can display the screen for [Send to Smartphone] by pressing this button.
8.
Control wheel 9.
For shooting: C button (Custom button)
For viewing:
(Delete) button
10.
(Playback) button 11.
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