QR
QR code (Quick Response code) is a visual code that, when scanned, might open a web page or download information. The user must have a QR code reader app installed and opened on their smartphone to read code.
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Low cost;
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Highly visible and easily recognizable;
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Broad consumer knowledge on how to scan;
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High compatibility across devices.
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Rely on good lighting conditions;
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Need to open an app to scan;
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Susceptible to physical damage;
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Usually discarded after event / purchase;
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Not secure.