＜Set includes "MINI-Z EVO2 Receiver Unit for KO-compatible transmitters"＞. ●Transmitter F/W version: Ver.3.00 or later. ●Compatible receivers: KR-420XT, "MINI-Z EVO 2 Receiver Unit for KO-compatible transmitters", "MINI-Z EVO Receiver Unit EX-NEXT MC-8".