I think it depends on the model, but unfortunately I can't find it either. So I suspect that it has something to do with the model, but otherwise it's a great laptop
I was able to do some research and, according to the manufacturer's instructions, there is indeed a built-in touchpad that can be converted into a numeric keypad by touch. The digits then light up as shown in the pictures and you can use the numeric keypad functions if, for example, you are working with a mouse or need to type a large amount of numbers.