A DVI-I Splitter. Split from your DVI device for example a PC to two displays (both displays will show the same image).
Split your DVI-I device to a display with VGA and another display with DVI-I. Recommended cable runs from this splitter are 3m due to the signal not being powered.
DVI-I Male Plug (24+5) VGA Female Socket (15pin) DVI-I Socket (24+5)