Remote shutter release cord is really a very useful and helpful gear for prevent vibration when taking photos under long exposures, close-ups (macro) or continuous shooting. The shutter release button of this remote cord can be pressed halfway for auto-focus and exposure metering. And, a shutter release button lock is available which for long exposures shooting and continuous shooting helpfully. Function Descriptions 1. Press the button half way to activate the autofocus and set the shutter speed. 2. Press the button completely to shoot. 3. For long exposures (camera should be set in Bulb mode), press the release button completely and slide it in the direction of the arrow, which locks the button depressed, slide the button back to its original position. Suitable for: Sony a100/ a200/ a300/ a350/ a700/ a900, Minolta a7D/ a5D Cable length: 1m Package Includes 1* Original manufactory package 1* RM-S1AM remote cord 1* User manual