Side laptop arm for iR400 mobile display stand. Folding tray features spring pin - press in, rotate up and out for use. Measures 20-inch wide and 13-inch depth. Slide out mouse tray extends (either side) to 8.26-inch wide and 7.87-inch depth with safety stop. Made of 22ga metal, powder coated finish. Arm sits at side of unit in usage position, and folds back behind unit for storage and transport.