What capability is NOT currently implemented in mainstream retail smart shelf technology?

Smart shelves are transforming retail inventory management and customer experience through IoT technology. These intelligent systems can track inventory in real-time, detect when products need restocking, analyze shopping patterns, and even interact with customers' smartphones. But how well do you understand the capabilities and impact of this emerging retail technology? Test your knowledge about what makes these systems truly 'smart' and how they're changing the retail landscape.

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Automatic weight sensors that detect when products are removed and need restocking
RFID technology that can track individual product movement and inventory levels
Facial recognition that personalizes pricing based on customer loyalty status
Digital displays that can change pricing and product information in real-time