How do I use a HeatStick with the IQOS 3 Duo?
Insert the HeatStick and gently press it down to the line on the filter, with the filter facing outside. Then press the Holder Button until the Holder vibrates and the light pulses white, and begin use once the Holder vibrates twice. (Page 6)
From the official Iqos 3 Duo manual, page 6
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