This is a Bluetooth-connected mobile trackball mouse. It comes with a dedicated case, making it portable. While portable trackballs are valuable, I especially appreciate the silent operation (no clicking sound), which is useful in places where noise is a concern. I bought two and used them with care, but I'm now selling one. Although designed for smaller hands, the concept of being able to use a silent trackball in a cafe, etc., was perfect for me. The Bluetooth connection is also smart, as it doesn't require an adapter. - Elecom Trackball - Brand: bitra - Model: M-MT2BRSBK - Size: S size - Color: Red ball - Connection: Wireless (Bluetooth) - Power: Battery-powered - Accessories: Dedicated case https://www.elecom.co.jp/products/M-MT2BRSBK.html There are almost no scratches or stains, but please understand that this is a used item.