The IndiPRO Tools Dual Power Grid & XLR Audio Box is used to power your Sony A7S camera using two available Canon LP-E6 Battery Packs (not included). It also adapts two 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 Sony A7 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. A clamp allows you to mount the unit to Light Weight Standard (LWS) 15mm support rods (not included). 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.