XKTTSUEERCRR 72 LED Ultra Bright Emergency Service Vehicle Dash Deck Grill Warning Flashing Strobe Light - 1 set (Blue) This product package includes 6 x 9led light blocks, 6 x 3led light blocks, 2 x control box with wires and mounting clips and screws. They are suitable for windshield, headliner, grille and deck, dash placement on your car equipped with a 12 Volt DC power source. These high quality and professional grade LED emergency strobe warning light bars are perfect for police officers, first responders, fire fighters, law enforcement, construction workers or emergency workers, and other emergency needs. Easy to install. First, make sure where you want to place these lights; Second, make sure the 7.5ft wires is enough long for your arrangement; Third, you can drill holes to screw the ligths on your car, or use a superglue, then wire the positive ( + ) and ground ( - ) wires to a 12V power source. There are 3 flashing modes: 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. Mode B- Light blocks 1, 2, & 3 flashes once, followed by light blocks 4, 5, & 6 flashing once. Repeats continuously. Mode C- All 6 light blocks flash once simultaneously with a brief pause betweetn each flash. Repeats continuously. 1 Year Warranty - 100% Satisfaction Guarantee from XKTTSUEERCRR. Please contact us without hesitation if there is any question.