Rosen PR-UN1670 Operation Manual page 21

To start Siri (There are 2 ways to use Siri.)
1. Press "VOICE" button of panel.
2. Press "VOICE" button of SWC.
3. Press and hold "SRC" button of SWC or "SRC" button of remote controller more than 600
milliseconds.
4. Siri screen will be displayed.
5. Talk your request.
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