Replicate trackside signal aspects on your control panel or CTC panel. 3 color (green, yellow/amber, red) LED with common anode (positive) wiring. Clear Fresnel lens: 0.19" outside diameter, 0.171" mounting hole, and 0.125" maximum panel thickness. Color-coded, 6" wiring harness included. Includes current-limiting resistors for either 5V or 12V DC power sources.