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

Smart shelves represent one of the most promising IoT innovations in modern retail. These digitally-enhanced shelving systems are transforming inventory management, customer experience, and retail analytics. They combine various technologies to create intelligent shopping environments that benefit both retailers and consumers. This poll tests your knowledge of this cutting-edge retail technology that's reshaping how products are monitored, marketed, and sold in physical stores.

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RFID (Radio-Frequency Identification) sensors for inventory tracking
Weight sensors to detect product removal and replacement
Facial recognition cameras for personalized pricing
Digital price tags that can be updated remotely