This is a Calme diving computer. It was purchased in September 2019. It is solar-powered, so there is no need to replace the battery. A protective sheet is attached to the LCD screen, so there are no scratches on the screen itself. The light also works. I have logged 245 dives with this dive computer. I had logged about 750 dives with my previous dive computer, so this one can still be used without any problems and its functions are normal. However, it was stolen on the boat. I finally managed to find it, and since then, out of frustration, I started writing my name on it. I wrote my name on the surface and also on the back. I have erased most of it on the surface, but it remains on the back. You can't see it when you're wearing it. I'm sorry. The instruction manual and the box are also included. I have noted the dive computer's serial number in the instruction manual from when I purchased it. The black part in the 5th photo has my name written on it. Please refrain from purchasing if you are concerned about any aspect of this item.