Compact In-line LED light flasher unit will condition the 12 volt output line on any string of LED lights and add a flash mode that increases the visibility of your vehicle. The 2 channel version gives 2 lines (typically a red channel and blue channel) for official or emergency vehicles. The flash rate is a F-F-F-pause, F-F-F-pause, it alternates left channel, right channel, both channels, and repeat, so the rapid 3 flash and pause is what is typically used on utility and emergency vehicles. Each line can hold up to 50 LED lights and is super compace, only 2" square module with the 2 input and 4 output ( 2 for each channel) wires. Typically the flasher would be installed on the 12 volt line after the switch and then grounded. All lights in the line must be LEDs or damage to the controller will occur. Waterproof casing can be mounted at first light or next to the line control switch. Working voltage is 9 - 16 volts. Sold per each flasher module.