Interchangeable Compatible with: All automobiles and devices equipped with a 12V power source. br 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. br Flash Mode B- Light blocks 1, 2, & 3 flashes once, followed by light blocks 4, 5, & 6 flashing once. Repeats continuously. br Flash Mode C- All 6 light blocks flash once simultaneously with a brief pause between each flash. Repeats continuously.