Xit XTMCD2RS Wired Remote Shutter Release for Nikon D3100, D3200, D5000, D5100, D7000, D90 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.