Vivitar DVR 850HDV3 User Manual page 10

 As this is a water resistance camcorder, you may feel that the door is very tight and difficult to open.
This is normal. Just follow the above instructions, and make sure to pull the USB cover lever to the
end of the slot.
CLOSING THE USB COVER
After charging and correctly inserting the SD card, make sure the Rubber Seal is clean and no dirt is
sticking to it before closing. Close the SD card cover door by gently moving it upwards with your finger.
To assure that the cover is closed properly, firmly press down on the section of the USB cover
appearing with four lines under the small USB cover lever as shown in diagram (A) below. You will
hear a "click" as it locks into place.
Note:
 Check that the small USB cover lever clicks back into place and is in line with the mark line
appearing on the side of the lever as shown in (B).
 Make sure the water resistant USB cover is closed properly before using the camcorder
underwater. If a gap appears reopen and close the USB cover as explained above.
(A)
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(B)