Thank you for viewing. Logitech ERGO M575SPd Ergonomic Trackball I bought this trackball to try it out and used it for about a week. While I got used to the operation, I often do fine, delicate work, and I felt that a trackball wasn't quite right for me, so I'm selling it. It's about ¥7,000 on Amazon. I've only used it for about a week, so it's almost like new. There are no problems with the operation, of course. Bluetooth connection and a USB receiver are also included, so you can use either. I cannot offer a discount. [Product Contents] Outer box, main unit, receiver, battery, simple instruction manual, warranty Everything that came with the purchase is included. #LOGICOOL #Trackball