Description: This is a worthy speed controller for computer fan. With 4 adjustable channels, it can control 4 fans of the computer at the same time, and efficiently protect your computer from heating. Working without noise, you can continue to work on your computer easily and safely. Features: Four channels for speed and temperature controlling, capable to manage 4 fans at the same time or adjust the individual fan speed. Effectively for heat reducing, maintain the proper temperature to keep all parts of the computer running well. Reduce noise, work quietly and do not disturb you while you are working and studying on the computer. 3.5'' floppy drive interface, easy to install. With blue LED which displays the working state 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/15.75-16.93inch Installation 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 .