1. This Product Is A Hub, Not Governor. The Speed Regulation Function Is Realized Through The Main Board, Not Through The Hub.To Realize The Function Of Speed Regulation, It's Necessary To Plug The Hub Into The 4-Pin Socket With PWM Speed Regulation On The Computer Motherboard 2. Support 4 / 5 PWM Fans, Compatible With 3Pin / 4Pin Fans 3. The Hub Interface Can Only Be Connected To The Fan Inserted In The CPU For Speed Measurement, And Other Locations Can Only Speed Control Without Speed Measurement 4. With Glue On The Back, It's Convenient To Fix The Hub 5. 4Pin Fan Connected To Hub Can Speed Governing, 3Pin Fan Connected To Hub Can Not Speed Governing. Main functions of the product: to solve the problem that the temperature control 4Pin plug on the power supply motherboard is not enough, and the hub has one interface, which can meet the power supply needs of multiple fans. Solve the problem of insufficient power supply interface of computer. colour: black Material: copper Size: Length 40cm Package Contents: 1 x PWM Hub Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.