BestDealUSA Remote Shutter Release for Canon Rebel XT, XTi, XSi, XS, T1i, EOS 1000D/450D/400D/350D/300D, Pentax Super/K100D/K110D/ *ist Ds2 / *ist D / *ist Ds / *ist / *ist DL, Samsung GX-20/GX-10/GX-1L GX-1S, + Many More! Help Preventing vibration during long exposures, close ups, or continuous shooting. Perfect to use during taking time-lapse photography and long time exposure. Halfway pressed button - For auto-focus and exposure metering Shutter release button lock - For long exposures shooting and continuous shooting Plug and Play