Left and Right V-Lifters: the V-lifter quickly and easily alternates the slope of the keyboard from 10 to 15 degrees positioning your forearms and wrists in a more comfortable position by reducing pronation. - Integrated padded palm supports ensures that wrists are neutral while resting. - Use with or without the pivot/tether. The pivot tether connects the two keying modules of the Solo keyboard together. Disconnect the pivot tether if greater separation is required. - Provides a highly stable typing platform with no ";bounce"; - Requires available USB port Compatible with PC and Linux* systems.