Logitech Logitech M570 Wireless Trackball Mouse (with receiver) *This is a junk item.* A blue Logitech wireless trackball mouse. This is an older model. The second button from the right (index finger) has come loose, resulting in poor responsiveness, so it is being sold as a junk item. Please be sure to understand this before purchasing. - Type: Trackball - Ball Color: Blue - Connection Type: Wireless Thank you for viewing.