This 23.5 MB PDF instruction document (Nikon calls it the “Nikon D7000 Digital Camera User’s Manual”) for the Nikon D7000 should prove to be a fantastic read, all 348 pages of it — be sure to download it.
Both English Language (printable and non-printable) and Spanish (non-printable) versions of the Nikon D7000 Guide to Digital Photography / Camera Owner’s Manual can be downloaded at NikonUSA.com.
The guide discusses the features of the D7000 and how to use the camera, for instance, on page 281, there’s an explanation that describes the use of optional Nikon GP-1 GPS Unit and Nikon MC-DC2 Remote Release Cord accessories which plug directly into the accessory terminal that is located on the left hand side of the camera body.
Other types of devices can be plugged into the accessory terminal — one example is third-party RF (radio frequency) remote control units such as the Phottix Cleon N10, Phottix Plato and Phottix Cleon II.
Nikon D7000 – Main page.