According to the leaked User's Manual, the Amazon Kindle will come with a detachable light source powered by 3 AAA batteries. Its advantage over 3rd party light sources is that it is held in place by built-in magnets and a custom slot in the reader. If this proves to be a popular feature, then presumably other vendors will do something similar in future readers. It could certainly be designed in, and then sold as an optional accessory (adding to revenue).
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