Mine is an AMB20 system. Hand out transponders only. There are 20, well 19 1 has a toast battery that needs to be sent in ta fix, and you just pass em out as needed, and you must returne em after each heat. Kinda a pain but once everyone knows its pretty smooth, usualy 2 or 3 guys, every heat who forget, I mean the same 3 guys LOL so ya just smack em and its all good
Works real well, stop buy on Saturday 728max and check it out
chris