The SDI multi viewer converts four SDI (SD, HD, 3G SDI) input signals into one HD Multimedia Interface output signal, displaying four different SDI sources on one monitor. It is used in video surveillance, control centers, rail transportation, video conferences, teaching, exhibitions, medical facilities, stadiums and conference rooms. This SDI quad multi viewer supports three switching modes: button switching, infrared remote control and RS232 serial port connected to a computer for software control. The output resolution is 1920x1080p at 60Hz, with input resolution ranging from 576x480 at 60Hz to 1920x1080 at 60Hz. The device is made of durable aluminum alloy. It supports four display modes: four screens simultaneously, one main screen with three auxiliary screens, dual screen display and single full screen display. Switching between single and multi screen modes is easy.