Extensor SDI4SDI enables a SDI, HD-SDI or 3G-SDI video source to be simultaneously distributed to four SDI, HD-SDI or 3G-SDI devices. It automatically adapts between standard definition and high definitition video formats and supports the full range of video resolution formats and frame rates. Extensor SDI4SDI features a lockable connector on the power supply to prevent accidental disconnection and an adaptor for use in a variety of countries. The compact device may be placed on a tabletop or wall mounted.