It's a Hacker C50 Maxx with their Master Car Sport controller. I picked it up for less than $100 used on another forum. Gotta keep your eye open for good deals! The Rx pack is for the controller - there is no built in BEC. I'd rather have it this way though, yes it's added weight, but that's really not an issue since it's just her toy. This thing *could* race and in that case I'd get a BEC and some LiPos, but since it's just for her, I'll save all the expensive stuff for me!