Kensington Orbit Wireless Trackball with Scroll Ring – Black-Red (K70990WW),

Customers find the trackball excellent in terms of ergonomics, noting it feels great in the palm of the hand and is comfortable to hold. The scrolling mechanism receives positive feedback for its smooth operation, and customers appreciate its ease of setup, taking about 5 minutes to configure. The trackball's precision and overall quality are praised. While the wireless functionality offers Bluetooth and RF connectivity options, some customers report issues with Bluetooth connections dropping temporarily. The movement control receives mixed feedback, with some customers reporting that the trackball moves uncontrollably.