This 24" 2.5mm to a7 Series Dummy Battery Cable allows you to power a Sony a7 Series camera from any power source with a 2.5mm barrel connector input and 7.2 - 8V output. It is an unregulated cable and cannot be used with devices outside the 7.2 - 8V range. The dummy battery end is compatible with the Sony a7, a7S, a7R, and a7 II, a7S II, and a7R II cameras. Made in USA.