This Quad Power System allows you to use four Canon LP-E6 batteries to power any camera that runs on LP-E6 batteries, such as the Canon 5D Mk III. This battery adapter features a compact form and conveniently attaches to your rig via a single 15mm rod clamp positioned on the side, and it connects to the camera using a dummy LP-E6 battery attached on the integrated 18″ cable. The Quad Grid offers four battery bays supporting LP-E6 batteries of all capacities. Only one battery is required to be attached at a time, so you get the maximum hot-swapping capability. An LED indicator remains lit as long as sufficient power is available. Made in the USA.