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

The food retail industry is rapidly adopting Internet of Things (IoT) technologies to enhance inventory management and customer experience. One of the most transformative innovations has been the implementation of smart shelf technology. These systems use weight sensors, RFID tags, and digital displays to track products, monitor inventory levels in real-time, and even interact with shoppers. How much do you know about this retail IoT revolution that's changing how we shop for groceries?

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Weight sensors that detect when products are removed or shelves need restocking
Digital price tags that can be updated remotely and display promotions
Voice recognition systems that respond to customer product inquiries directly from the shelf
Temperature monitors for ensuring proper conditions for perishable foods