The Calumet N10 Wired Remote Shutter Release Cable is a compact & easy-to-use remote switch that means that you can activate all the functions of your camera's shutter release button without touching your camera. This is useful when making long exposures & to avoid camera movement. To activate your camera's focus, simply press the shutter button down half way. To trigger the camera's shutter, press the button completely down. for long exposures, press the button down completely & slide it in the direction of the arrow to lock it in position. When your exposure is complete then slide the remote's button back into its original position. Compatible cameras include the Nikon D90 / D3100 / D5000 / D7000 Cable Length: 3 feet (0.9 meters)