The newest addition to Peterson Manufacturing's line of Piranha LED Smart Lamps is the 10-diode, 4-inch Round models. They are SAE J845 class two compliant and DOT approved. The Smart Lamps is an advanced warning light technology that combines strobing LEDs and automatic turn signal override functions in one self-contained lamp. Designed for full compatibility from model to model, each lamp unit has electronic strobe and turn signal functions built in, plus digital "synchro wire" technology that keeps lamps in both dual and quad system installations perfectly synchronized. All Smart Lamps feature a triple-flash strobe function that can be manually activated or configured for automatic strobing when the vehicle is shifted into reverse. Activating the turn signal automatically overrides the alternating strobe function.