A DVI-I Splitter. Split from your DVI device for example a PC to two displays (both displays will show the same image).
DVI-I Male Plug (24+5)
VGA Female Socket (15pin)
DVI-I Socket (24+5)
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.