Kaavie Remote Switch Cable Shutter release for D90, D5000, D5100, D3100, D7000 as MC-DC2
This product is Compatible with Nikon D90, D5000, D5100, D3100, D7000.  The Kaavie CR-12 Series Remote Switch is a compact wired remote switch with a cable which replicates all functions of the camera's shutter release button. Handy for taking pictures of subjects that are difficult to approach, or to minimize vibration for close-ups. How to use: Press the button half-way to autofocus. Depress the button fully to trigger the shutter. Press the button and slide it forward to lock for longer exposures.