This 3-Pin Fan Cable Y Splitter Cable allows you to add 2 fans instead of one. The tough braided cable sheathing gives the cable longevity and helps with cable management. 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.