Which innovative feature was NOT included in Amazon's first generation 'Dash Cart' when it launched in 2020?

Smart shopping carts are transforming the grocery shopping experience with advanced technology. These high-tech carts integrate various features to enhance customer convenience and streamline the shopping process. Test your knowledge about this emerging retail technology that's changing how we shop for food!

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Automatic product identification using computer vision and sensors
Built-in scale for weighing produce items
Personalized recipe recommendations based on cart contents
Skip-the-checkout capability with integrated payment processing