The Logitech Cordless Optical Trackman is a strange beast, a one-eyed beetle from outer space that could scurry away from your desk any moment. Once you realise that it is just patiently waiting for your orders, you put your palm on the extra smooth surface (it’s really nice and soft) and discover that this serious trackball means business.
Logitech recently replaced this Trackman Wheel with the new wireless M570, and is currently hard to find. The Trackman wheel is slightly bigger than the M570 and has a wire, but this is exactly why some people prefer it.
Logitech recently replaced this Cordless Trackman Wheel with the new wireless M570, and is currently only available in eBay. The Cordless Trackman Wheel is slightly bigger than the M570 and has only two buttons.