There are two ways to start and end a recording. 


Method 1

In the Reflector 2 Preferences, if you have "Show Client Name" set to "Always" or "Hover", you will see the option to start recording at the top of the mirrored image on your computer. 

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Method 2

You can also record from the Reflector 2 menu. Once your device is connected, simply open the Reflector 2 menu and press record.

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Method 3

You can also use key commands to begin recording. 

Press Command and R to begin or end a recording.