HDMI / TWO Channel Input Module for Marshall MD Series Monitors Marshall Electronics" MD Series of rack mount monitors offer a flexible modular solution to system integration. These rack-mountable monitors can be configured with a variety of video inputs that can be "swapped" or interchanged in the field based on your evolving needs and requirements. This eliminates the need to upgrade or replace equipment when a different input or application is required. This "future proof" solution provides flexibility and reassurance when necessary, especially in multi-monitor rack mount units.