This has a fully integrated 1-channel switch decoder with 1 function output. The special thing about the decoder: It is super small and contains many special functions that are not available in any other decoder, such as the uncoupling track mode: In this mode, a function output switches in combination with a switch output. If the uncoupling track is active, the "E" lamp lights up, otherwise it goes out automatically. This means you always know whether the uncoupling track is set to "uncoupling" or "normal", indicated by the autonomous switching of the lighting. It can be conveniently clamped/glued under a threshold of the LGB track and, optionally packed in a shrink tube, it is well protected against the weather, or cast in hardware store silicone under the threshold is ideal for outdoor.