Compounds having selective action at neuronal N-type calcium channels useful for the treatment of pain in accord with the following structural diagram, wherein R1, R2 and R3 are a variety of groups as defined in the specification. In one aspect, the electronic apparatus comprises a main unit, a phase-change material and an enclosure enclosing the main unit and the phase-change material. After controlling the communication speed of the second communication device to be a communication speed defined in advance, the host controller controls the communication speed of the first communication device to be the same communication speed as the communication speed of the second communication device. The signal generating circuit generates data signals having different levels according to a gradation value specified for the unit circuit. The base structure and the emitter structure preferably are formed in the same processing chamber. Each pixel PXL is divided on a flat surface into a reflection area R for reflecting the external light incident from the front side of the display panel to display an image and a transmission area T for transmitting the illumination light incident from the back side of the display panel to display an image.