If your DVI extension cable is 15 feet or shorter, you can use this In-Focus DVI-D to M1 Adapter Cable to extend it even farther. Cables, because of their distance-sensitive signal strength, must not be over a certain length, depending on cable type. This extender is configured to maintain a strong bandwidth for use with your In-Focus or ScreenPlay projectors with M1-D/M1-DA ports.