Which technology is NOT typically integrated into modern retail 'smart shelf' systems?

Retail IoT innovations are transforming how stores track inventory, engage shoppers, and optimize operations. Smart shelves represent one of the most promising applications of this technology, combining sensors, digital displays, and real-time analytics to create a more responsive shopping environment. How well do you understand this emerging retail technology that's bridging the physical-digital divide?

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RFID sensors for automatic inventory tracking
Weight sensors to detect product removal
Biometric facial recognition for personalized pricing
Digital price displays that update in real-time