Description: This is a worthy speed controller for computerfan. With 4 adjustable channels, it can control 4 fans of the computer at thesame time, and efficiently protect your computer from heating. Working withoutnoise, you can continue to work on your computer easily and safely. Features:Four channels for speed and temperaturecontrolling, capable to manage 4 fans at the same time or adjust the individualfan speed. Effectively for heat reducing, maintain theproper temperature to keep all parts of the computer running well. Reduce noise, work quietly and do notdisturb you while you are working and studying on the computer. 3.5'' floppy drive interface, easy toinstall. With blue LED which displays the workingstate of the speed controller, simple and elegant. Specifications: Color: Black Output Voltage: DC 12V Output Power: 8W for Each Channel Voltage Range: 5 - 12V Power Indicator: LED Indicator (Blue Light) Length of Cable: Approx. 40-43cm/15.75-16.93inchInstallation Location: Floppy Drive Interface: 4P Male Head + Female Head Fan interface: 3Pin + 4Pin Controllable Fans: Max. 4 Sets Size: Approx. 10 * 10 * 2.1cm Package Weight: 150g Package List: 1 * Fan Speed Controller for PC 1 * User Manual .