Instruct: Classify Amazon reviews into positive or negative sentiment
Query: OK for low-power devices, but AC power needed for anything else

I bought this device last summer (and, in retrospect, paid a lot more than I should have) because my Thinkpad T30 doesn't have built-in USB 2.0, just USB 1.1. It works OK with low-power devices like scanners and flash drives. However, to run a high-power device (especially one that doesn't already have an AC power adapter of its own, such as Seagate's FreeAgent Go external hard drives), you need to obtain the AC power adapter (available separately) for this card. I don't know, myself, where to get one, so I'm going to find another USB PC Card that does have a power adapter included. Avoid unless you have power adapters on hand for all your high-power-using USB devices.