The RL-AC13S from Rolux is a battery plate that allows you to power your camera, LED light or sound set. You attach the RL-AC13S to the universal 15 mm camera rods (not included), thanks to the two holes at the bottom. Then you place a battery on the RL-AC13S 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.