The ST-4815-O Pro Series is our MTO approved (Ontario) trailer-mounted arrowboard that comes with 15 LED lamps and orange reflective sheeting background with flap system for better visibility. It features our innovative single-mast design, wireless V-Switch controller, Stealth technology, OptiBright technology and is wired to integrate the Smart Arrowboard option. The unit combines energy-efficient design and high-quality construction to provide the most reliable and cost-effective arrowboards on the market.