E-ink devices are wonderful for reading books. Plenty of your favorite e-book readers use this technology. This gadget uses the same technology to bring you 25000 chess puzzles. It has medium and hard checkmate puzzles that are in the lichess public domain. It is fully charged in 2 minutes and lasts for up to 100 screen refreshes.
More gadgets like this: here
The Lightnote Chess Edition has a button that you press once to go to the next puzzle and twice to go back. It weighs only 31g. A Kanji edition is also available.
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