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McDonald's Canada has turned its cardboard drink trays into portable speakers for smartphones as part of a limited release at a beach on Toronto.

Through a partnership with the University of Waterloo’s Audio Research Group and industry design company Stacklab, the McDonald’s Boombox was created with no electronics involved. 

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Instead, it takes the sound coming from a smartphone’s speakers and increases them by amping up the sound pressure levels via the cardboard speaker enclosure.

The boxes are only available for a limited time at Toronto’s Woodbine Beach, as a way of 'bumping up the volume' while enjoying a burger.

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