Abstract: This camera has a plurality of light-emitting devices such as LED, which flicker in response to the number of shots which can be photographed. Also, while having no liquid crystal display for showing an error when it occurs, this camera has a non-volatile memory for writing an error code. When the camera is connected to a computer, the error code can be displayed on the computer screen.

Abstract: A power supply unit for an electronic device includes a power plug and an interconnection between the poser plug and the device. A power plug for an AC-DC adapter fits into a battery compartment of an electronic device instead of into a separate jack. The power supply unit includes an elastic cover that ensures a positive connection between the device and the power plug to prevent accidental disengagement of the power plug from the device. The power plug and battery compartment are configured so that an incorrect power plug cannot be connected by mistake. The configuration preferably includes a switch to signal the device that an AC-DC adapter is installed.