Logitech M570 Logitech Trackball This is a wireless trackball that uses a Logitech USB receiver. Bluetooth is not supported. Includes receiver. Operation has been confirmed. This item is being sold as junk due to occasional chattering when clicking, and the uncomfortable feel of the forward and back buttons (though they do function). Please understand this before purchasing. Logicool Wireless Trackball M570 Brand: logicool Mouse/Trackball Type: Trackball Cable Type: Wireless Logicool Wireless Trackball M570 M570 Brand: logicool Mouse/Trackball Type: Trackball Cable Type: Wireless Connection Method: Wireless (2.4GHz) Number of Buttons: 5.0 buttons Optical Resolution (dpi): 400.0 dpi Color: Gray, Blue Battery Type: AA