A smart nano-blackboard is also called a nano-blackboard all-in-one machine. It is generally divided into 65 inches, 75 inches, 85 inches, 86 inches, 98 inches, 100 inches, and 110 inches. Ordinary blackboards have a lot of dust, causing air pollution and endangering the health of teachers and students. Double Window Display, Outdoor Digital Kiosk , Advertising Screen Digital Signage , Wall Mounted Digital Display ,Menu Board Screens . We warmly welcome friends from all walks of life to cooperate with us. The product will supply to all over the world, such as Europe, America, Australia,Portugal, Austria,Anguilla, Italy.Save time three times. Save time for customers to queue up, and save time for merchants to order and cashier, so that merchants have more time to entertain more customers and increase restaurant revenue;