Power up to 4 PC fans from a single 4-Pin PWM fan header, to solve the lack of pc case fans ports and reduce the load on the motherboard. The 4 way PMW interface is connected to the motherboard cpu fan interface, 1 x 4-pin male for CPU fan, 3 x 4-pin male for case fan. Compatible with 12V CPU and case fans with 4 pin or 3 pin connector, the extension cable offers greater flexibility between motherboard and CPU cooling fans. Easy to install, just insert the PWM chassis fan splitter cable into the motherboard, and then paste the other end to the chassis with double-sided tape. Black sleeved nylon braided cable, more durable and make the internal of pc case looks more clean & tidy.