This is the "WING BINDER" vertical monitor stand, which received support from many backers on the crowdfunding platform "Makuake." By using it to stand up a laptop or mobile monitor, you can easily create a dual-display environment. Product Name: WING BINDER Size: 210mm x 297mm (folded: approximately 6mm thick) Condition: Used a few times, but I think it's in relatively good condition.