The LT1 is included with all Digitrax Starter Sets. It consists of a harness with 6 conductor Telco type wire and a male plug, a tester with a female 6 conductor jack and a protection resistor. If you make your own LocoNet cables, this is a handy device The Factory NewTCA Grade: C-9Operational Status: Manufacturer: DigitraxModel Number: LT1Scale/Era: HO ModernModel Type: DCC/Electrical