How do I activate Siri with Beats Studio Buds?

Say 'Hey Siri' or press and hold the Beats logo button on either earbud. When you hear a chime, say what you need. If you haven't set up 'Hey Siri' on your iPhone already, you'll be guided through the setup when you first use the earbuds.

From the official Beats Studio Buds Wireless Earbuds manual, page 6

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