The rl-ac12s from rolux is a battery plate that allows you to power your camera, led light or sound set. you attach the rl-ac12s to a camera cage or rig with threaded connection, thanks to the included screws and hex key. then you place a battery on the rl-ac12s and power is available through two d-tap ports. the voltage available depends on the battery. d-tap is a universal standard used to power various professional cameras and accessories. optional accessories include a recommended v-mount battery and various d-tap cables. Application rl-ac12s When your camera's battery runs out too quickly and you don't want to switch batteries, you can count on the rl-ac12s to provide a large power capacity. thus, it is no problem to shoot all day long without changing the battery. the aluminum housing ensures minimal weight and reliable operation. both universal d-tap ports can be used simultaneously to power devices; for example, a canon dslr camera with a led lamp on top.