Black sleeved 4 way PWM splitter hub for computer fans Designed for the need to control numerous system fans Capable of expanding one motherboard PWM fan header to support up to four fans Support PWM Function, Speed control, satisfy your control needs.Compatible with 3-pin / 4-pin Fans Our products will be shipped after strict quality inspection. Due to long-distance transportation and distribution, various unpredictable situations can occur. If it is damaged or unusable, please contact us directly and we promise to reply to you within 24 hours,and solve all your problems.