You cannot add "Lenovo Yoga C640 - Intel Core i7-10510U 1.8Ghz, 16GB RAM, 512GB SSD, 13.3" FHD Touch & Flip, Intel HD Graphics, Wireless, Bluetooth, Camera, Stylus Pen, English Keyboard, Windows 10 Home, Grey Color, 1 Year LENOVO Warranty |81UE0088AK" to the cart because the product is out of stock.