Don't take a chance using any type of electronic or even mechanical device for strategy while in a casino. Instead, learn the strategy at home. You'll make fewer mistakes and be able to play faster.
The best way to really learn a strategy is to practice on version 3 of Optimum Video Poker which displays the strategy chart in the format of your choice next to the game window and shows you in the chart when you make an error. That way you learn to relate dealt hand types to their abbreviated description in the chart.
The program runs on Windows, Mac and Linux. See my web site for a free download of a demo version and discount prices for new purchases and upgrades.
Dan
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Dan Paymar, developer of "Optimum Video Poker" software
Visit my web site at http://www.OptimumPlay.com
"Chance favors the prepared mind" ~ Louis Pasteur