Direct From The Manufacturers Website:
” Signalist SC1 – LED signal decoder
With an integrated current source and configuration available for common cathode or common anode LED wiring connecting your signals is complete simplicity. No resistors are required and brightness is easily configured for each output independently with simple CV settings. Flashing aspects are maintained within the SC1 to reduce the control system overhead to a minimum.
The SC1 consumes negligible power so can be powered from the track or accessory bus with no requirement for an external power supply.
The SC1 is simply the best colour light signal decoder available.”