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Woman reveals VERY clever hotel trick to charge all your gadgets – and people are stunned – The Sun | The Sun
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Hotel secrets: Room key card hack to use power revealed on Twitter | Travel News | Travel | Express.co.uk
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Use a keycard to get into work? Put it in the case of your phone (if big enough) for convenience. : r/lifehacks
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Digital Lock-Picking: This Simple Arduino Hack Opens Millions of Hotel Keycard Doors « Null Byte :: WonderHowTo
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