SMART Technologies Inc. has made available the SMART Board 400 series interactive whiteboard, which recognizes pen and finger inputs and enables users to easily interact with digital content. The product supports Microsoft Windows and Linux operating systems and ships with SMART Notebook collaborative learning software. The 400 series offers a 4:3 aspect ratio and standard display size of 77 inches (195.6 cm) on the diagonal and the durable 3-D surface, which supports images and video, is optimized for projection without producing hot spots.