The Marshall Electronics ML-454-V3 Quad 4.5" Screens LCD Display is a feature-packed, economical solution perfect for fly-packs, control rooms, routing rooms and countless other video system applications. Looping video inputs set this product apart from similar-looking products. With the ML-454-V3, you are not limited to the single SDI connector you may find on competitor models. Standard power and tally connections as well as a logical menu structure make this display an easy choice for flexible system designs.