A high-voltage alternating current light-emitting diode structure is provided. The extendable sleeve has a variable length. The system control unit controls registerability of the user information to the user information registering unit for each function with use permission determined by the information processing apparatus. Only when the electrical connection between the capacitor and the latch control signal line is disconnected, the first voltage is applied to the capacitor and the second voltage is applied to the latch control signal line. Broadband gain control operation over several wavelengths can be achieved by controlling the frequency and electrical drive power of the chosen frequencies feeding the acousto-optic devices.