© 2014 RailMaster Hobbies TCS KAT Series HO Scale Decoders KAT22 - 2 function, comes with 9 pin socket with built in KA2 (5-10 second) keep alive - $46.36 KAT24 - 4 function, comes with 9 pin socket with built in KA2 (5-10 second) keep alive - $48.76 KAT26 - 6 function, comes with 9 pin socket with built in KA2 (5-10 second) keep alive - $52.76