Traffic Light Controller/Sequencer 6-Channel Programmable, Crosswalk & Arrows User selectable duration from 3 second to 2 minutes (per RED or GREEN light). Four modes - full intersection, traffic light with crosswalk, or traffic light with arrows Separate digital control for "YELLOW" allowing for more realistic operation (1 to 8 seconds) Solid state switching for silent operation (no clicking mechanical relays) Compatible with all traffic lights & bulbs (non-dimmable LED bulbs included).