When you purchase a genuine SoundOff Signal flasher you can be assured that you are buying from the leading flasher manufacturer. We invented the very first high conspicuous - extreme use "wig wag" headlight flasher over 25 years ago. Our expertise, unmatched technical support, and No Hassle Warranties are why we remain the trusted leader in flasher systems. It's a fact, we manufacture & sell more flasher systems than all of our competition combined. And our taillight flasher systems are designed to offer you the best protection available at the most critical moments on the job. We take public safety, the safety of your officers and keeping your agency's fleet operational very seriously. *image above is the relay flashback.