Noctua NA-SYC2, 3 Pin Y-Cables for PC Fans (Black) Y-type splitter cables for running two fans on one fan header RPM signal of one fan is transmitted to the motherboard for speed monitoring 3-pin connectors for 3-pin fans Black connectors and black cable sleeving for clean optics Set includes 2 cables; Trusted Noctua quality backed up with 6-year manufacturers warranty