Indipro B-Stock products may show various signs of use, such as dents or scratches that do not affect product function. All B-Stock items have been quality tested and comes with a 30 day limited warranty. The Pro Series Power Grid & XLR Audio Box is used to power your Canon 5D/7D camera using two available Canon LP-E6 Battery Packs (not included). It also adapts two High quality NEUTRIK XLR inputs to a 3.5mm stereo mini output to provide 2 audio channels directly to your camera. One end of the Dual Power Grid has a dummy LP-E6 battery that is inserted into the camera’s battery bay. The other end is connected with an 18″ cable and features a space saving dual-sided battery plate that mounts one LP-E6 Battery Pack on each face. The batteries snap securely into the plate. The Power Grid Pro Series is made with light weight Aircraft grade aluminum enclosure and includes one 1/4″-20 mounting inserts on the top and bottom of the grid unit, for easy mounting. A built-in blue LED indicates sufficient voltage supply to the camera. You can hot swap the batteries without having to power off your camera. Made in USA.