Kensington Expert Mouse Wireless Trackball

Kensington is back with a wireless version of the Expert Trackball. I guess now they fixed the wireless issues as it supports both 2.4Ghz wifi and Bluetooth 4.0 LE

http://www.kensington.com/en/gb/4493/k72359ww/expert-mouse-wireless-trackball#.VoooHpN96q1