This DVI Dual Link Extender/Equalizer allows you to extend DVI video signals up to 150 feet while maintaining a pristine image. This competitively priced DVI extender takes a signal from the source via a short (15 foot or less) standard DVI cable and then sends it up to 150ft to your display . The unit features a Plug and Play design and includes an EQ switch with 8 level settings for signal adjustment. Comes set to the default setting of "0" which does not modify the signal at all. After connecting your cables if your image does not appear you can adjust the EQ from setting number "1" which is the highest setting all the way to "7" which is the lowest setting. unit comes with a small screw driver to adjust the EQ settings. Power adapter also included.