Pioneer and Apple both sell tower speakers that are powered by USB. You can also find these items for sale from a number of different manufacturers online at Amazon.
Some cheap speakers for your computer include the Geeks 2 Piece USB Powered Speaker Set for $3.99 or the VIBE Ultra Thin USB Powered Set or the iMicro USB Powered set.
Quite often by the USB plug on the speakers. If by non-powered you mean powered by batteries, then normally by the AV/headphone connection on your laptop.
There are several places where one can purchase an USB powered Oscilloscope. One can find USB powerd Oscilloscopes on Amazon, eBay or Pico Technology.
A USB hub that runs on the power provided though the USB cable (rather than a USB hub powered by an external electrical supply).
There are several places where one can purchase an USB powered Oscilloscope. One can find USB powerd Oscilloscopes on Amazon, eBay or Pico Technology.
You can buy powered USB hubs online at websites such as Amazon, eBay, Tmart, CellPhoneShop, and Shop411. You can also find them on the websites for major retail stores such as Best Buy, Radio Shack, and Walmart.
Sound On, Audiodengine, logitech, and hp all make speakers that plug into a usb port.
If you would like to plug a microphone into your speakers, Logitech offers a speaker with a port for a micropholne.
a USB laser pointer is simply a laser pointer powered by the USB socket.
A powered USB hub is needed if you have a lot of items to be plugged in and charging. iPods seems to need a powered hub to have enough current to charge fully.
it means using a USB to power something instead of a plug
I would have to say that wireless speakers are better because there are no cords to get tangled over and USB can easily short out.