This "Reel Power - Camera Fitting ALEXA (RP-CFA1)" attaches to the back of the ALEXA, ALEXA Plus, ALEXA Plus 4:3, ALEXA M body, ALEXA Studio, ALEXA HD, ALEXA HD Plus, ALEXA XT, ALEXA XT M body, ALEXA XT Plus, ALEXA XT Studio, ALEXA SXT EV, ALEXA SXT Plus, ALEXA SXT Studio, ALEXA SXT W or ALEXA LF and accepts Hawk-Woods 26V Reel Power on-board batteries. RP-CFA1 has two D-tap and two 24V RS connectors.