be careful, these motorola-specific AC adapters generally won't work with any other devices except for motorola.
have you ever had a usb->mini-b cable, plugged it into your computer with your motorola Q, and found out you need to install drivers BEFORE you can even charge it? when the same cable can charge practically any mini-b device (cellphone (HTC), camera, ps3 controller, etc...) no problem?
it's because motorola decided to f*ck everyone over by reversing a couple pins in their connectors, just to be "different".
that's why mini-b AC adapter by motorola typically only charge motorola devices, and not others (like an HTC cell phone, a Kodak camera, ps3 controller, etc...)
blackberry made it so it takes both regular mini-b and the backward-asstastic motorola chargers.