One thing to mention. Some people find the LED light will flicker when plugged into a USB port on the eDGe.
I've observed this with the above light, although not always (e.g., right now it doesn't). Tech Support is investigating to see if there's something about how the eDGe monitors the USB ports (say for a memory stick or something being plugged in). The nice thing about the above light is that you can run it off the included battery (and being just 2 LEDs, the battery probably would last months).