LATEST 30 BIGGER LEDS: The latest model has 30 led beads, which are much brighter than the same type of top lights. EASY TWO WAYS INSTALLATION: Comes with strong magnets (Test go up to 60mph but not fall off) and 12V-24V cigarette plug . Just need attach the strong magnets on any metal exterior of cars and plug the cigarette plug.Or drill two holes to install it, withtwo screws in the package UNIQUE PATTERNS - Select from distinctive flash patterns, including Single Flash, Double Flash, Quad flash, Clockwise Rotation, Counterclockwise Rotation, and multiple combination modes. lets you use your most recent flash pattern with theclick of a switch. SIZE: 3.8"*2.3" (Base Size) x 5.2" ( Height ), with cord for power connection BEST BRIGHTNESS FOR THE BUCKS - Whether you're a volunteer fireman on a budget or a cash-strapped police department, you will not find a more economical and brighter visibility lighting solution. Perfect for EMTs, construction workers, and traffic crews.