Solid state construction, no bulbs to break or burn out. 100,000 hrs rated life. Fully sealed, submersible construction. Potted circuitry(coated and sealed) protects against moisture, corrosion and vibration. Lower amp draw than incandescent lights. Designed to directly replace 456-Series incandescent lights. Integral, dedicated side marker diode. Exceeds all DOT rear lighting and reflex requirements for trailers 80 in wide and over. 7-15/16 in W x 2-7/8 in H x 2-7/8 in D.