Nilight&reg; 54 x LED Red Blue Emergency Vehicle Strobe Lights/light Bars for Windshield High Quality Interchangeable / Compatible with: All automobiles and devices equipped with a 12V power source. Flash Mode A- Light blocks 1, 2, & 3 flashes rapidly for 8 times, followed by light blocks 4, 5, & 6 flashing rapidly for 8 times. Repeats continuously. Flash Mode B- Light blocks 1, 2, & 3 flashes once, followed by light blocks 4, 5, & 6 flashing once. Repeats continuously. Flash Mode C- All 6 light blocks flash once simultaneously with a brief pause between each flash. Repeats continuously. Extremely low power consumption rate.