Pro Battery Grip for Nikon D5100 EN-EL14 DSLR Camera
The item you purchased is a Pro Battery Grip for Nikon D5100. It has a built in vertical shutter release button, and can hold two EN-EL14 rechargeable battery packs. Additionally, it comes with a signal transferring cable with which you will be able to use a shutter release.http://www.linkdelight.com/battery-grips.html