Superbpag USB Powered 5 Cooler Fan Laptop Cooling Pad for 12-17 inch Notebook with Adjustable Speed and Quantity Black Ergonomic designed gradient for easy typing, 2 switches to control 4 small fans and big fan individual The fans quietly whir the heat away from your laptop at a rate of 1000RPM , producing 70 CFM of airflow. Plug and play, no external power supply is needed, no software installation is required.. Fan Selector Buttons 1 Big Fan, 4 Small Fans or Both at the Same Time. 15*12.5*2.5 inches,5 Built-in silent fans(Main:120x120x25mm,another four:70x70x15mm)with LEDs for maximum thermal heat dissipation.