Abstract: A detection device and method commonly used for a video interface outlet and earphone line outlet is used to allow the detection device to detect whether a three- or four-terminals plug is inserted in the outlet. The detection device detects whether the impedance value of the video output terminal of the plug is larger than the preset value. If yes, the detection device control a video signal output terminal to output a video signal. If the impedance is not larger than the preset value, the detection device then controls the video signal output not to output a video signal and only to output an audio signal.

Abstract: An image display remote control device for digital camera or video camera of the invention is capably separated from the body of digital camera or video camera. Both said image display remote control device and said body of digital camera or video camera are provided with Bluetooth communication module capably communicated with each other. At a distance, users can directly observe the picture taken by said body of digital camera or video camera from a display screen installed on said image display remote control device. Therefore, Using keys for remote control of said image display remote control device of the invention, the user can also control the focus, diaphragm and shutter of said digital camera or video camera by remote control to adjust the picture taken more delicate and vivid.