New generation ergonomic of mouse, combining the optical mouse with the trackball mouse creatively, Off-table design for free and comfortable operation. Ideal for laptop users. Ideal for presentation or lying dawn you can also play games , viewing movie or other operation. you can also use it conveniently, especially when you are in the narrow space, like in the car, train or in the plane. That greatly ease the harm of palm joint or muscle for long time using mouse, completely solve the "mouse hand".