Dnano Starter Pack
 

Hello there. I got my starter kit working the other day but having trouble pairing the cars. I've got three out of four pared, but the fourth one will not bind. Any suggestions? Using the standard KT-18 transmitter and the first three cars are working perfectly. So I'm confused as to why the fourth one is giving me trouble.
Is there a limit to how many cars can be pared with one KT-18?