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 Power Grid & XLR Audio Box with Dual LP-E6 Plates with Sony NP-FW50 dummy battery provides power to your Sony a7 Camera using two optional Canon LP-E6 type batteries. It converts two XLR inputs to a 3.5mm stereo audio output to provide two channels of audio directly to your camera. The Power Grid System incorporates a clamp so you can mount it to optional LWS 15mm support rods and it features a right angle power plug to keep the cable neat and snug on the camera. The Power Grid features a two-sided design that mounts the batteries one on each face, although only one battery is required to supply the necessary voltage to power the camera. A blue LED built into the plate lights up to indicate sufficient voltage available to power your camera. You can hot-swap your batteries without powering down the camera, as long as there is always a sufficiently charged battery in the Power Grid. The Power Grid System is Made in the USA.