If you travel a lot the number and weight of transformers quickly becomes overpowering. There is a line of "everywhere" adapters called iGo. In the USA it is available at Radio Shack and on-line. (Maybe elsewhere, not sure.) So I carry one transformer and a bunch of adapters that allow me to charge my laptop, cell phone, camera, handycam, mp3, and my Reader. If you are interested, it is adapter (or "tip" as they call it) A54. It is rated at 5.4V, produces 5.41 V without other loads on the circuit. The Reader charger produces 5.39 V. Both fit the same plug and have '+' tip and '-' collar (ring.)
The main unit that I am using will work from a wall outlet, auto jack, or airplane connection.
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