This Quad Power System allows you to use four Canon LP-E6 Type batteries to power your Sony a7/a7S /a7R camera. This battery adapter features a compact form and conveniently attaches to your rig via Two 20 inserts that are positioned on the top and bottom of the unit, and it connects to the camera using a Sony A7 dummy battery. The Quad Grid offers four battery bays supporting Canon LP-E6 batteries. 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.