These high-intensity directional LED warning lights are specifically designed for vehicle headlight and tail light applications. The 9011?s optic design produces wide angle light dispersion and maximizes secondary light output reflected off the vehicle light casing. The concealed, 4 LED, 12VDC Hide-A-LED has 16 flash patterns and multiple units can be synchronized to flash alternately or simultaneously. Hide-A-LED s also synchronize with 3510 Series directional LEDs. Hide-A-LED s also synchronize with 3510, 3830, 3931 & 3932 Series directional LEDs.