The Marshall ML-454-V3 Quad 4.5 inch Rack Monitor Monitor 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.OverviewFour 4.5" HD Screens Four high compliance 3G panels provide full time viewing access to multiple production sources with very accurate rendition. The panels are easily matched and and maintain calibration almost indefinitely. On-Screen 3 Color Tallies Easily visible border tallies provide instantaneous process control feedback to the operator. Compact Panel 2RU (3.5") Height Rugged, all metal construction makes the ML-454-V3 at home in any rack mount or standalone application. Great Off-Axis Performance Excellent angle of viewing allows the user to position the rack in any number of physical locations.Official Product Data Model: ML-454-V3 Category: Monitors UPC: 801813230031 HS Code: 8528529100 Official Documentation Official Product Page Owner's Manual (PDF)