Xit XT80RS Wired Remote Shutter Release for Canon SLR & DSLR 1D-series, 1Ds series, 5D series, 50D, 7D and all other similar model cameras. The remote replicates the functions of the camera's shutter release button. The remote is great for close-ups and other situations where the slightest camera movement would produce blurring. Locking the shutter release will give you long time-exposures (bulb), and unlocked, for burst photography.