USB Powered and Most Efficient Metal Cooler Pad with 3 Built-in Fans for Notebook Computers 3 Built-in 60mm fans for maximum thermal heat dissipation. Compatible with USB 1.0 & USB 2.0. Built-in On/Off switch. Aluminum panel with heavy-duty design and silver anodized finish. Ergonomic designed angle for easy typing. Plug and play, no external power supply is needed, no software installation is required. Airflow : 28 cfm./Fan Speed : 1500 rpm/Noise: 25 dBA/Voltage : DC 3 V/Power : &lt; 0.9 W/Current : &lt; 180 mA/Dimension (mm) : 300(W) x 240(D) x 40(H) Brand new, one year warranty!