Yeah the wireless usb thing has a long and sordid history. Bottom line is that most of the products that have come out over the years have sucked real bad. A host of range, speed, and consistent signal issues. The only real good one i know if is the Ircon WiRanger (
http://www.icron.com/products/usb/wi_ranger.php) but its expensive. Like $400 expensive!
A company called Wisair developed a very promising wireless usb module (
http://www.engadget.com/tag/Wisair/) and cables unlimited has a licensed product based on this module:
http://www.amazon.com/gp/product/B001GV00ZMI haven't had time to thoroughly test it yet, but I will post back here when I get a good feel for the product.
UPDATE: This wireless USB sucks --I'm attempting to get by the auto-censor and should be beaten after I re-read the rules--. It works, but the refresh rate is slow and its not very energy efficient (gets very hot).
As for power, it depends on what you want to do with your setup. The actuator can draw up to 5amps at maximum load, the button and trackball LEDS can gobble up to 1.38 amps via USB (all usb devices draws power from my 4.5 amp usb hub), the red and blue LED table lighting eats about 2 amps.. And the wireless USB needs AC power too... no way i could use a battery there...