Fans are powered using a standard USB connection that can be connected to your laptop or computer using a mini-USB cable. Includes a USB hub to help share the USB connectivity used to power the built-in fans. Adjustable height (4 levels) lets you use as a laptop stand with external keyboard, while the bottom ledge keeps the laptop in place. Velcro® straps keep peripheral cables neat and tidy. Sturdy, durable construction
