Samsung SM-G970F User Manual page 24

Basics
Wireless charging
The device has a built-in wireless charging coil. You can charge the battery using a wireless
charger (sold separately).
Fast wireless charging
You can charge your device faster using the fast wireless charging feature. To use this feature,
you must use a charger and components that support the fast wireless charging feature.
If the fast wireless charging feature is not activated, launch the Settings app, tap Battery and
device care → Battery → More battery settings, and then tap the Fast wireless charging
switch to activate it.
A fan inside the charger may produce noise during fast wireless charging.
Charging the battery
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Place the centre of the device's back on the centre of the wireless charger.
The estimated charging time will appear on the notification panel. The actual charging
time may vary depending on the charging conditions.
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