iKross Black Aluminum Panel Cooler Pad with Blue LED for Toshiba Portege Z830 / Z835 / Z930 / Z935 series Ultrabook laptop USB powered, fashion and unique design, for comfort at work or on the go. 4.7 IN x 4.7 IN big and quiet LED cooling fan helps maximize laptop performance by keeping it cool while in use Built-in easy to control switch for speed adjusting Adjustable stands provide all positions height adjustment for the perfect typing and viewing angle. Compatible with majority of laptops, support up to 15" and under size laptops. USB powered, no external power supply, plug and play