Blackmagic Design SmartView HD 17" Rackmount Monitor, Ethernet Control, USB 2.0 This Item Includes: Large 17 inch LCD display in a 6 rack unit size chassis, less than 1 inch thick SDI/HD-SDI/3G-SDI input with re-clocked loop outputs Ethernet input with loop output for connecting to computers for central adjustments Tally input allows red, green or blue tally indication Control software panel included free for Windows and Mac OS X