Brand: ELECOM Color: White Type: Trackball (index finger operation) Ball Size: 34mm Number of Buttons: 5 Features: Artificial ruby support, silent buttons Thank you for viewing. I purchased this through a pre-order and opened it, but the size didn't suit me, so I'm selling it. All accessories are included. (The battery for operation check is inside the mouse.) I only used it for about 10 minutes to check the operation and connection, but I would appreciate it if you could purchase it understanding that it is a used item.