Got this Delton S22 vertical mouse still in the box. I only tested it, and it works perfectly because it's brand new. It's one of those ergonomic ones that can be way better for your wrist if you're at a desk all day or have any kind of condition/injury that affects your hands. Comes with the little USB dongle so it's just plug and play. Box has a tiny bit of wear on the corner but the mouse inside is perfect. Great if you're trying to avoid that wrist strain.