In one embodiment, a printhead assembly includes: an ink reservoir; a printhead; a passage for carrying ink from the ink reservoir to the printhead; and a port from the passage to a source of air pressure. The instep enclosing section is removably attached at first and second side edges adjacent the inner and outer edges of the sole portion, respectively. A drain potential at the NMOS transistor is monitored by an interface circuit, for indirectly monitoring a potential. Rotation of the actuator in the opposite direction will cause the fingers to move in the opposite direction. The input and storage device stores a unique identifier for the particular merchant each desired gift is from.