Samsung SM-R325 User Manual page 24

Getting started
Replacing the device holder
The USB Type-C device holder is attached to the Gear VR by default.
If your mobile device's multipurpose jack is USB Type-C, you can
connect the mobile device to the Gear VR. If your mobile device's
multipurpose jack is Micro USB, replace the device holder with the
Micro USB device holder before connecting your mobile device to
the Gear VR.
Device holder lock switch
Locked Unlocked
Micro USB USB Type-C
device holder device holder
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