Here are a few examples of codes for you to try - from auto-setting an alarm (attached to prescriptions or on packaging - parking meter reminder etc.) to encrytped codes for security or verification - whatever the need UpCode provide the solution. 

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Depending on your phone or reader codes can be read from as small as 12mmx12mm (or less, for many mobiles) up to poster size and beyond on any printed surface, or on-screen... as illustrated below -