VERY RARE TO SEE CARDED NEW OLD STOCK; 1991 Vintage TYCO Total Control Racing TCR Plug-In CONTROLLER #6421 is 55ohms. This listing is for ONE (1) Carded Controller. It can also be used directly in the TYCO Command Control System. It can also be adapted to work on nearly any Slotless HO system from Ideal, Majorette or Aurora. Sold as is. Descriptions are very accurate; No Returns. PLEASE ASK QUESTIONS BEFORE YOU BUY IF YOU ARE UNSURE. We ship promptly professionally. We happily combine orders refund any excess s/h immediately upon shipping. We can always provide tracking. I charge $1 for expert handling/packaging, actual shipping. We ship out of the country almost daily. Please refer to our feedback, social media or time selling HO slot cars for assurances of a good honest deal. Happy motorin' thanks S'lots from Bob at Slot Car Central in SYR. We Know H.O.