Wi-Fi, 512MB of onboard storage, and an optical trackpad instead of the trackball. The arcade version used a trackball and joystick combination for player control. Users were often presented the option to purchase a pointing stick, touchpad, or trackball. This included the Sidekick-patented swivel screen, the hidden keyboard, and the trackball. A keyboard with trackball is the input device for operation of this system. Production units used a joystick in place of the trackball. The Mighty Mouse supported two buttons, and a miniature trackball for scrolling. Some computer users prefer a trackball over the more common mouse for ergonomic reasons. In 1990, the Bloomberg keyboard was released with a trackball and built-in voice-chat features. Kensington's SlimBlade Trackball similarly tracks the ball itself in three dimensions for scrolling. The phone lacks the navigational trackball found in many previous Android devices. The player controls the marble by using a trackball. The Portable pioneered inclusion of a pointing device (a trackball) in the laptop/portable sphere. A trackball and jump button are used for controlling Bentley Bear's motions. They are identical in principle to a computer trackball (pointing device).