Hi I rad on an ebay advert the the unit with the blue light was a cheaper version and used a slightly inferior screen, is this true as the asking price was £99 against £139 for the unit with a red light
The LED in discussion is the one that comes on below the button to the right of the screen when the rocker switch (menu / home) is at the top. When the device is being charged a colored LED (red or blue) comes on.