A device includes a nozzle for delivering a fluid flow into a container, a valve having a movable valve member for controlling the fluid flow, a member for sending a position control signal to the movable valve member, such that the movable valve member is expected to follow an expected displacement vs. The components data are converted to HDL data. Apoptosis can be characterized by a cellular morphology comprising cellular condensation, nuclear condensation or zeiosis. The keyboard including the above components can provide multiple functions for illuminating the push buttons although having a simple structure.