Feature: 1. [LCD Display] The speed controller has a ultra wide viewing angle LCD display, black screen and pure blue number display, you can see the computer work at a glance. How to Use: 1. The product is installed into the case 5.25 inch optical drive port 2. Lock the screws to make it safe and stable 3. Connect the 4Pin port to the corresponding port of the power supply 4. The fan is connected to the corresponding fan terminal Specification: Item Type: PC Fan Controller Material: ABS, Aluminum Alloy Size: Approx. 14.7 x 9 x 4.2cm / 5.8 x 3.5 x 1.7in Controllable Fans: 4 Sets of Fans Power Supply Interface: Big 4P Male Fan Interface: 3PIN, 4PIN Interface Output Voltage: 0-12V Input Voltage: 5.6-12V Display: LCD Screen Power: 20W Package List: 1 x PC Fan Controller 1 x User Manual 4 x Stickers 4 x Screws