Plug this BattleBorn Red 3-Pin Fan "Y" Splitter Cable into an available 3-pin connection on your motherboard or fan controller to receive an additional fan header. As an added bonus, these cables are sleeved in a variety of colors to add some flair to your system. Note: Only one 3-Pin male connector has a tachometer/speed wire. This is because motherboards/fan controllers cannot accurately read the fan speed when two speed signals are being given simultaneously. This cable is made correctly to avoid this problem, with only one tachometer wire on one of the male connectors.