The Gefen EXT-3GSDI-144 is a 1:4 3G-SDI Distribution Amplifier which allows a single SDI, HD-SDI or 3G-SDI video source to be distributed to (without loss of signal) four HD SDI/HDSDI/3GSDI devices at the same time. Crisp, highly defined visuals are generated in NTSC or PAL formats supporting Standard and High Definition resolutions to 1080p Full HD.