The Nikon ML-L3 is an infrared remote control designed to work with Nikon digital single lens reflex cameras and some of Nikon's Coolpix compact digital cameras. Before electronics and this technology became commonplace, if you wanted to remotely activate a camera shutter release, you needed to attach a shutter release cable that screwed into the top of the shutter release button.
Mount your camera to a tripod and position it toward the scene you will be photographing.
Turn the camera on and press the "Menu" button. Rotate the main selector dial until "Delayed Remote" or "Quick Response Remote" is visible in the LCD (liquid crystal display) screen.
Press the "Set" button located in the middle of the four-way controller on the back of the camera to select the shooting mode for the ML-L3 remote.
Look through the camera viewfinder to compose the picture you will be shooting.
Hold the ML-L3 remote control in your hand, aim it at the camera and press the button to take the picture.