Samsung SM-S901E/DS User Manual page 74

Apps and features
Detaching the S Pen
Press the end of the S Pen to disengage it. Then, pull the S Pen from the slot. To store
the S Pen, reinsert it into the slot and push it until it clicks into place.
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Charging the S Pen
The S Pen must be charged before you can control apps remotely by using the S Pen
button.
When you insert the S Pen into the slot, charging will start.
If the Air action feature is deactivated, the S Pen will be charged only when the device is
charging.
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