Product Features [Super Bright] 78 Hi-intensity LED chips with high visibility in daylight, midnight, raining or fog days. Improve the driver security and avoid accidents. [Easy Installation] comes with 4 Heavy Duty strong magnets (Test go up to 80mph but not fall off). Just need attach the strong magnets on any metal exterior of cars and plug the switch plug. [Flash Patterns] 27 different flash patterns with a independent switch to cycle through modes. Memorizes last pattern used (recall last pattern) [Panel Dimensison] 37.5" (W) x 6.5" (D) x 3.1" (H) / Cable length: 16 FT straight cable with on/off power and independent control switch, plug and play / Up to 50,000hours lifespan expectancy. Compatible with all those vehicles equipped with a 12-24 volt power socket. Great for emergency vehicles, postal service, construction vehicle, safety warning etc.