A sealed cell includes a sealing body that includes an iron-based terminal cap and an aluminum-based safety valve. The coin dispensing apparatus has a throwing-out device and a noncontact type detecting device. The differential demodulation module generates differentially demodulated signals based on the input signals. The connector also has solder bump terminals, attached to the second side of the substrate so as to be insulated from the wire bond terminals, the solder bump terminals being configured to be coupled via solder balls with a second set of the terminals of the integrated circuit. The lens is positioned on the underside surface and aligned with the active device. The inventions has the good features of both types of conventional keyboards, resolves problems of both and adds additional features.