The present invention utilizes magnesium diboride or B2 as a superconductivity thin film which can be applied to a rapid single flux quantum circuit. The keyboard data are transmitted in an HID report containing identifiers for one or more keys that have been pressed and force data for each key. It may be an adherent troche, preferably adhered to teeth or gums or cheek with acacia gum. The blood analyzer is capable of handling and analyzing blood samples. In particular, the invention relates to corresponding particle-containing compositions by means of which extremely fine structures can be etched very selectively without damaging or attacking adjacent areas. When the voltage of the battery reduces to a predetermined value, the controlling circuit controls the warning circuit to alarm.