Lenovo ThinkPad P1 Gen 2 User Manual page 32

Store the pen
The ThinkPad Pen Pro is delivered with a pen holder. To store the ThinkPad Pen Pro on the computer:
1. Insert the pen holder into the USB connector on the computer.
2. Insert the ThinkPad Pen Pro into the pen holder in any ways as shown.
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P1 Gen 2 and X1 Extreme User Guide