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 4 light blocks flash once simultaneously with a brief pause between each flash. Repeats continuously. Extremely low power consumption rate. Super bright LEDs. 30,000+ hours of lifespan. Each light block (9 LED light bulbs) is Dimension of light bar: 7-1/8” W x 1-1/4” H x 1-3/4” D. Completely waterproof. Perfect for for front grille and interior. Easy installation process. Each LED light bar would be connected to an 8 feet long extension wire. Each extension wire will then be connected on to the controller. Wire the controller's black (- ground) and red (+ power) to the power source accordingly. Mount LED light blocks to desired location. What is in the package 4 x light bocks with brackets 4 x 8 feet extension wires 1 x set of mounting clips and screws 1 x control box with 3 flash modes