A compact hydraulic supply unit has a housing forming a reservoir for a pressure fluid, and includes a housing bottom, a housing cover and a housing middle part therebetween in the form of a profiled tube. Based on the indicating signal, the terminal selects and performs the optimum reception operation. A correspondence detector brings bright spot display positions on the display at multiple times into correspondence with their projection positions on the photo device in accordance to recording time. The processor calculates the total number of flash memories, determines a driving current value according to the total number of flash memories, and directs the driving current generator to generate the driving current with a level greater than or equal to the driving current value. The battery exchange slit is covered with a Velcro fastener, to enable the area to be opened or closed.