The coupler is used in conjunction with a compatible adapter allows you to power your Digital Camera directly from an Power source. This is a preferable means of powering the camera when shooting in a studio environment, when shooting tabletop product photography, or any photo situation where the camera may need to be powered up for long periods of time.
Spec. With DC cable
Line Length: 30cm
Line diameter: Φ3.5mm
DC connector size: 5.5 x 2.1mm
Parameter: 9V/4.5A
Protection: Shot and Overload Circuit Protector
Compatible models: Nikon D7000 D800 D600 For Nikon1 v1