27Microphone/Remote release port - behind the rubber dust seal is a2.5mm socket. This port is a dual function device allowing an externalmicrophone (like the Panasonic MS-1) or any other electret condensermicrophone with a 3.5mm female to 2.5mm male stereo adaptor cable tobe used. It can also be used for connection of a wired remote shutterrelease switch or intervalometer to do time lapse photography, forexample. The port can only be used for one function at a time.HDMI and AV port on the left hand side of the camera (viewed from thefront) behind the large dust seal flap are 2 ports. The largest is a miniHDMI socket for connection of the camera to an external display or TVset and the smaller port provides a lower quality, composite video plusleft and right audio signals.Back of cameraEVF/LCD button - provides the facility to switch the display from the LCDscreen to the EVF (electronic view finder) and vice versa.Replay button - switches the camera from the recording mode toplayback mode allowing the last image or video clip to be reviewed on theLCD screen.AF/AE Lock button - this button is used to provide exposure, focus orboth exposure and focus lock depending upon how this button isassigned in the set up menu.Depressing this button with the camera aimed with the focus squarealigned on the subject will cause the camera to evaluate and lock thefocus or exposure or both.This locked exposure and focus will remain in place until the button isagain depressed or the camera is turned off. The button can also beassigned as the Fn2 button if the AE/AF lock facility is not needed andthen another function could be accessed by depressing this button.Fn3 Button - gives access to a user programmed function which will beexplained later.Disp Button - allows the method by which screen information ispresented to you.By depressing this button it is possible to cycle through the displayoptions available to change the level of detail shown.