The Calumet Pro Series N10 Wired Remote Shutter Release from Calumet Photographic; a staple within the world of photography for nearly 70 years; acts as an extension to your camera's shutter release button.
With its compact and intuitive design, the remote allows you to activate all the functions of said shutter release button without touching your camera.
This comes in especially useful when trying to avoid camera movement - long exposure work is a great use for this remote.