Ring Engineering LM-3S RailPro HO Scale Locomotive Module with Sound SPROG II v4 USB ■ Back feed protection

■ Back feed protection

Helps to meet ANSI/ESDA S20

■ Short circuit proof

Function 2 is a special non-latching key that can be used to sound the horn for as long as the key is held down

the engine sounds will automatically react and reflect the increase of power needed to crest the hill

Ring Engineering LM-3S RailPro HO Scale Locomotive Module with Sound SPROG II v4 USB ■ Back feed protectionThe LM 3S is a module that you can install into a model train locomotive so the locomotive can be controlled and set up by a Ring Engineering RailPro Controller, such as the HC 2 Handheld Controller with a Color Touch Screen! After the LM 3S is installed in a locomotive, you will be able to control the locomotive speed, direction, up to 6 light outputs, and sounds! The LM 3S has a Direct Radio (RF transceiver) built inside. The built in RF module