Which innovative feature is NOT currently being implemented in smart shelf technology for food retailers?

Smart shelf technology is transforming how grocery stores operate, combining IoT sensors, digital displays, and AI analytics to revolutionize inventory management and customer experience. These innovative systems can automatically track stock levels, detect misplaced items, display dynamic pricing, and even analyze shopper behavior. As retailers look for ways to compete with online shopping, smart shelves represent one of the most promising frontiers in food retail innovation.

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Real-time expiration date monitoring that automatically adjusts prices as products approach their sell-by date
Personalized nutritional recommendations based on shoppers' health profiles detected through facial recognition
Weight sensors that detect when products are removed and automatically update inventory systems
Digital price tags that can change dynamically based on demand, time of day, or inventory levels