CE Compass Wireless Remote Shutter Release RS-60E3 For Canon 500D 350D 400D 550D 1000D Press the button half way to activate the autofocus and set the shutter speed Press the button completely to shoot For long exposures (camera should be in Bulb Mode), press the button down completely and slide in the direction of the arrow / hold, which locks the pressed button, slide the button back to its original position when finished