Features: With auto focus B-door single and continuous shutter function (Need accordingly right camera settings) Connection method: 1. Shut down the camera power; 2. Open the camera protection cover; 3. Insert the plug into the shutter socket; 5. Open the camera power. Usage: 1. Release the shutter button half press the button to achieve auto focus 2. Release the shutter button completely press the button to achieve shutter 3. Completely press the shutter button and slide forward to HOLD position lock the button to achieve long time exposure and continuous shooting 4. When you need open the lock slide in the opposite direction.