a stationary pointing device that provides a small, flat surface that you slide your finger over using the same movements as you would a mouse. You can tap on the pad's surface as an alternate to pressing one of the touchpad keys.
... Input unit (so-called 'touchpad'), the exterior dimensions of which do not exceed 50 x 62 mm, capable of matrix scanning and detection, consisting of 2 layers of measurement electrodes, a printed circuit, a capacitive matrix, 2 integrated circuits, discrete components and a connector, for use in the manufacture of products falling within heading 8471 (a) ...
