Be careful. Which AMB works where depends on the decoder box and AMB System your local track uses and other places where you might go to race. MRTs new PT works with the new AMB System according to some racers who have tried it. It is much cheaper than any AMB. The second locked thread at the top of this topic is a run down on what AMB works with which system and which does not.
I am sending some of my current MRTs in for their trade in deal. I trade in my older MRT and get the new one for $32 plus shipping from England. Just so you know what is out there.