GSI Super Quality Professional Remote Switch Trigger for Canon/Pentax/Samgung -- CANON EOS-350D, EOS 400D, EOS-300D, EOS-300, 300V, 3000, EOS-50, 50E, 500, RS-60E3, 60D - PENTAX K100D, K110D, K10D, ist DS2, K20D, K5, K7, Samsung GX-1L, GX-1S, GX-10 Cameras, Functions Exactly as the Canon/Pentax/Samgung RS-60E3. Two stage release button: halfway pressing for auto focus Lock the button for long exposures or continuous shooting Prevent camera shake for super telephoto shots, macrophotography, and bulb exposures, Great distance shooting No Batteries Required, Synchranized Port, Great for the Professional or the Beginner Cable Length; 1M - 3.3 Feet For distance shooting