STL Fog Light/Surface Mount SUMMARY: With 9 Generation III 1-watt LEDs and surface mount capability, the STL Fog Light/Surface Mount propels the warning power capabilities of all emergency vehicles and motorcycles. Powered by 12V Weather-proof housing 9 Generation III 1-watt LEDs Illuminating TIR optics 18 available flash patterns Non-volatile memory recalls last flash pattern Lifespan of up to 100,000 hours Includes cable-no switch box included Built in self contained flasher Dimensions without bracket: 4.25" Diameter x 1.25" H Dimensions with bracket: 5" Diameter x 1.25" H 7 day money back guarantee 1 year warranty INSTALLATION INSTRUCTIONS： 1. The STL Fog Light/Surface Mount includes (1) light head with (4) cables coming from the unit. 2. These cables include a red, black, yellow, and white cable. 3. The red and black cables are used to hook up to the power source/switch box (red to positive, black/ground to negative). 4. The yellow wire is used to change the flash mode. This is done by touching the yellow wire to the red wire. 5. To synchronize two units together, connect the yellow wires from the two units together 6. The white wire is only used when synchronizing two units together. Please note; when synchronizing, it is better to just choose the same pattern for the units and connect them to a switch box on that pattern so they work together but don’t have to be wired together. 7. For Fog light use (unit only fits new model Chevy Tahoe Fog Light), remove fog unit in vehicle and replace by installing STL Fog Light in its original position. 8. For surface mount use, attach bracket included with unit and the three holes allow you to permanently mount the unit on a flat surface.