led blinking with usb

Will this work?
Powering arduino with 2 red leds and 2 blue leds blinking on arduino uno via usb from my ar drone 2.0 video recording usb slot that gives off 5v? Yes or no answer please......also how many volts will come out of digital pins when board is powered by usb. Thank you

Yes usb will power it (using resistors with the leds)....

5v 40ma per pin (200-300 ohm resistors)

Thank you so much.....ive asked so many other people and they just confuse me but u gave me a good answer thanks so much.