Yi Tunnel, commonly known as SandStar, is an artificial intelligence company that provides leading computer vision technology for the retail industry. The advanced retail solutions engage shoppers with grab-and-go convenience, autonomous checkout and big data analytics, serving businesses worldwide. Founded in 2016, SandStar has over 220 engineers. The company provides Smart Kiosks, Pure Computer Vision Smart Shops, and Smart Store Analytics. Headquartered in Charlotte, North Carolina, SandStar serves 20 leading companies.