Samsung Galaxy S7 User Manual page 21

1. Insert the USB cable into the USB charger/Accessory port.
2. Connect the USB cable to the charging head, and then plug the
charging head into a standard outlet.
3. Unplug the charging head from the outlet and remove the USB
cable from the device when charging is complete.
Note: This device is also compatible with wireless charging devices
approved by Samsung, which are sold separately.
Getting Started 10 Assemble Your Device