Shop Nilight 42 LED Roof Top Blue Red Strobe Lights Hazard Emergency Safety Warning LED Flashing Light Bar w/Control Panel Magnetic Mount 12V 24V Car Truck Tractor Snow Plow Construction Vehicles in high quality, support 2 Years Warranty. This strobe lights is plug and play and comes with 4 magnetic cups with a total of 20 magnets. Just attach the magnetic base on any metal exterior of cars and plug the cigar lighter.