Abstract: A charging device with a USB interface. The AC power adapter receives external AC power. The car lighter adapter receives external DC power provided by a DC power output terminal of a car. The battery pack receives another external DC power provided by batteries. The voltage converter with an AC-to-DC converter and a DC power converter converts external AC power and external DC power received by the car lighter adapter and the battery pack to DC power having a predetermined voltage level. The USB output terminal outputs DC power.

Abstract: The present invention provides a testing device for testing an automatic exposure function of a digital camera. The testing device includes a holding device, a light box, and an optical module. The holding device is used for holding the digital camera. The light box is used for providing a light source. The optical module is disposed between the holding device and the light box for changing a light intensity of light source projected onto the camera. The optical module includes a rotation device. A driving device is used for driving the rotation device to rotate, and a plurality of optical lenses with different light transmission rate are disposed on the rotation device.

Abstract: The invention provides an automatic charging device via a USB and method of operating the same. The charging device comprises: a battery charger; an indicator; an USB interface; and a charging controller.

Abstract: The invention provides a digital camera with a disposition device for automatically converting a picture to an appropriate image meeting the vision via the viewfinder, wherein the disposition device for auto-detecting the holding condition of a digital camera comprises: an insulating envelope having a cavity which is formed by an insulating bottom and side wall, wherein the cavity is divided into a plurality of concave regions; a conductive plate covering the cavity of the insulating envelope and connected to the power source; a plurality of conductive pads selectively located on the insulating bottom; and a conductive ball rolling in the cavity by the influence of gravity, wherein the movable sensor touching one of the conductive pads and the conductive plate represents the holding condition of the digital camera.