Let's Tea utilises self-invented robotic patents to serve freshly made bubble tea according to customer's preferences 24/7 through automated vending machines. With an area of less than 10 square feet, Let's Tea converted the lobby of commercial building into a bubble tea shop offering over 100 drink combinations. Each machine has a capacity of 400 cups and generates annual revenue of over HK$ 400,000. The machine has been proven in commercial buildings, universities and hospitals.