A non-contact input apparatus for computer peripheral includes an induction module and a pointing module. The causality module analyzes multiple events to determine whether the events are causally related. A chamber is formed in the main section for receiving the ball of the ball valve. The cover assembly includes a metallic cover welded to an open end of the casing. Component B comprises a plurality of units, each of the units substantially exhibiting a shape, such that this shape substantially exhibits a long dimension and a short dimension, with the short dimension being in a direction that is essentially perpendicular to the direction of the long dimension and the short dimension being in the range from 0.