This is no ordinary flasher. It gives you the opportunity to set almost any flashing pattern you would like composed of yellow, white, red, and black. You will be delighted at how incredibly easy it is to do. Put this flasher in your car's rear windshield when stopped on the side of the road at night. Or carry this flasher while walking in low-light conditions. Use it as you would use any of the stand-alone flashers on the market. But unlike those flashers, Best Emergency Flasher will always be with you when you have your phone. To set your own flashing pattern, go to the "Pattern" tab and touch the color or colors you'd like see from 1 or more of 8 columns. And changing the flash rate couldn't be easier. Just use the slider control on the "Speed" tab. TO FLASH: Tap the "Flash" 'TAB BAR ITEM' at any time to begin the flasher using the most recent settings for the pattern and the speed. There is a "Help" tab to remind you what you can do, and how.