When Amazon Go first opened to the public, what unique feature distinguished it from traditional retail stores?

Amazon Go stores revolutionized retail with their 'Just Walk Out' technology that eliminated checkout lines. This cashierless shopping concept uses advanced AI, computer vision, and sensor fusion to track what customers take from shelves. The technology represents one of the most significant innovations in physical retail store layouts and operations in decades, blending digital convenience with brick-and-mortar shopping. Test your knowledge about this groundbreaking retail concept!

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No checkout process - customers could simply take items and leave the store
All products were delivered by drones inside the store
Customers had to scan and bag their own items at self-checkout kiosks
All shopping was done via augmented reality headsets provided at the entrance