Are both gaps on both ends of the handle looks like a V shape from the side? I believe that is similar in function with something like this https://www.amazon.com/gp/product/B01HI5U32Y . If the rods that form the V are grey/dark grey, it will be for steel blade, and if it is white, it is for ceramic. The grey area on one end probably either for forming before go to the V (if it feels like whetstone), or for stropping (for after go through the V). Search knife sharpener on Amazon and you'll bound to see video of how they use similar product.
The knife is drawn through the slots and then finally honed on the abrasive pad for smoothness. I would guess that one slot has carbide (metallic appearing) cutters, the next has small ceramic rods.
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