Very well done. Used twice for one hour each when snorkeling in the Galapagos Islands. There were moderate waves during one session. Has not expired. All the controls worked fine except for one for switching to different modes of the program. It didn't matter much. The lack of a handle was a downside. I attached a strap to my camera and vest so I wouldn't lose them. It actually floated in sea water and I could release it from time to time if needed. I haven't dived deep in the ocean but have tested it several times in a 5 foot deep pool with no leaks.
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