The BLINK App is for pedestrians walking or jogging by a road at night. By using the BLINK App the pedestrians phone will become a beacon, allowing them to be seen from 5 times further away.
The flash and screen of the smartphone emit a flashing light on both sides of the phone, as a beacon in the dark. The sequence of light is not disturbing, nor drains the batteries more than any other normal application.
Be visible by wearing light-colored and reflective clothing. Drivers are often not expecting walkers to be out after dark, and you need to give them every chance to see you, even at street crossings that have crossing signals.
Also remember to just be as cautious at dawn or twilight, as drivers still have limited visibility or may even have the setting or rising sun directly in their eyes. Walk on the side of the road opposing traffic when there is no separate sidewalk. This way you will see the cars approaching you.