How do I activate Siri on my Beats Studio Buds?
If you have already set up 'Hey Siri' on your iPhone, it is ready to use with your Beats Studio Buds. You can activate Siri by saying 'Hey Siri' or by pressing and holding the Beats logo button on either earbud, then saying what you need when you hear a chime.
From the official Apple Beats Earbuds manual, page 6
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