I bought a blue led usb cable off newegg for my printer. I think its blue when on, and blinks when data is flowing through it. it's not really that bright tho, just the end plugs light up. newegg has 10 footers for like three or four bucks, but shipping is like four or five bucks. still, cheaper than a three foot non-led radio shack cable for $20 (had to buy one in a pinch awhile ago )
basically it will light up when its connected, and start flashing when datas are going through....depending on which brand cables you are buying..some brand is bright some are not...just another fancy substitution for USB 2 cables...
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