Xprite 18 LED Emergency Vehicle Strobe Warning Lights/Lightbars For Deck Dash Grill Windshield Headliner (White & Yellow/Amber) Xtreme 18 LED Emergency Vehicle Strobe Warning Lights/Lightbars is the most economical way to outfit one's vehicle with emergency lightings. The set is perfect for police officers, fire fighters, first responders, construction workers, or anyone who needs their vehicles to be visible while on the job. 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. Package includes: 6 x mini light blocks with brackets & 6 x 8 feet extension wires & 12 x set of mounting clips and screws & 1 x control box with 3 flash modes & 1 x Fuse ( Owner manual not included, Easy for installation )