The Core SWX Battery V-Mount Plate for Sony PXW-FX9 attaches directly to the rear of the camera and connects via a DC output cable. It also provides a 4-pin XLR input to allow for hot-swapping. Plug in a 4-pin XLR external power source and you can swap out your V-mount battery. The plate secures to the camera using screws provided on the back of the camera, under the removable cover plate on the rounded corner. At the same time, a protruding U-shaped component on the bottom of the unit inserts into the camera's battery slot. The DC cable provides a 19.5V output that's compatible with the camera. An LED on the side of the plate provides warning of low battery status. When the plate is not in use, the DC cable can be kept inside a dedicated compartment that's on the interior side of the plate.There are also two D-Tap outputs for powering accessories. A USB port is also available for firmware updates. The plate is made of durable aluminium.