How do I know when my session is almost finished?
To signal the last 30 seconds or last 2 puffs of a session, the IQOS 3 Duo Holder will vibrate twice with the light pulsing white. After the session is complete, slide the Cap upward and remove the used HeatStick. (Page 6)
From the official Iqos 3 Duo manual, page 6
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