DEEPCOOL N8 Black Laptop Cooler, 2.5mm Pure Aluminum Panel with Dual 140mm Fans, Support 15.6"-17" Laptop, 4 USB Ports 2.5mm thickness Pure Aluminum Panel with shape of wave. Max wave height reaches 7mm Dual 140mm fans offers big airflow and high cooling performance Superb air intake design offers optimal airflow to cool your notebook 4 USB ports. One USB port can be used to power the cooler, while the others can be connected to external USB devices Support 15.6"-17" laptops