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Turn to set.
Tap plus, then turn your iPhone like the dial of a kitchen timer. The red fills in, a minute every six degrees.
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Tap for milestones.
Tap the dial on the way to mark a moment, like 10 minutes left. An alarm tells you when you get there.
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Tap to start.
The red runs back to zero. When time's up, an alarm rings, even with the app closed.
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Share the timer.
Show the QR code. Another iPhone scans it and counts down to the same moment.