TTSSP1 Sensor Signal Starter Pack 4 AspectCONTENTS 4 x 4 Aspect Sensor Signals (TTSS5) 1 x Mimic Switch (TTMS1) 5m Single Core Wire Instructions DETAILS Now you can add automatic signalling to your layout in seconds with new 4 Aspect Sensor Signals from Train Tech. HOW IT WORKS A sensor is built into every signal so there is no wiring or extra circuit boards etc. Just clip or wire the signal into your track for fully automatic 2, 4, or 3 Aspect Signalling which works just like the real