Progo remote shutter release cord is a useful gear to prevent vibration when taking photos under long exposures, close-ups (macro) or continuous shooting. <br /> The shutter release button of this remote cord can be pressed halfway for auto-focus and exposure metering. A shutter release button lock is available for long exposures shooting and continuous shooting. <9> Package Content: <br /> 1x Progo Remote Shutter Release Switch <br /> 1x User Manual