[. . . ] VF-SPR1 © 2017 Sony Corporation Printed in China Precautions • When attaching this unit, be sure to tighten all of the four screws firmly. [. . . ] €¢ Do not subject the glass to strong shock, as it may crack. Failure to do waterproof packing maintenance according to the instructions may lead to water leaks and cause this unit to sink. Inspect the waterproof packing • Carefully check that there is any dirt, sand, hair, dust, salt, threads, etc. €¢ Be careful not to leave any cloth fibers on the waterproof packing after wiping it. [. . . ] €¢ Check the surface of the camera that comes in contact with the waterproof packing as well. [. . . ]