On the sides, again, everything is almost the same — volume rocker buttons on the right alongside the power button, and there is a dedicated camera shutter button as well. (phoneradar.com)
As with all phones underwater, the touchscreen doesn't work, but there's a dedicated camera shutter button for aquatic pics. (cnet.com)
However, the buttons are speculated to act as camera shutter buttons, power buttons or a shortcut key for certain features. (phoneradar.com)