JJC MA Series Remote Switch for SONY cameras
This remote shutter switch has a two stage release button, and will autofocus on a half press of the button and trigger the shutter with a full press. For long exposures, just press the release button fully and slide it into the locked position. The shutter will stay open as long as the shutter release button is locked. To unlock the shutter, just slide the release button back to its original position. In addition, the unit does not require batteries as it draws its power from the camera. It is