Underdesk installation. Includes a highly-adjustable platform that has left and right lateral adjustments. Articulated mousing platform adjusts up, down, left, right, forward and back and tilts forward and back. The Precise™ mousing surface can mount left or right. The adjustable arm raises up to 10 inches above mounting surface for sitting or standing posture for optimal ergonomic benefit. Sold by each. 25% recycled content.