Garmin Varia Smart Tail Light. Whether you're training, commuting, or just out for an evening ride with the family, the Garmin Varia Smart Tail Light helps create a safer cycling environment by adjusting to changing light conditions. When paired with the Garmin Edge 1000 Cycling Computer, the tail light automatically adjusts its brightness for better visibility in ambient light situations. It operates in Solid or Flashing modes and increases intensity when the bike decelerates to warn approaching traffic. By adding a second tail light, cyclists can utilize turn signals, which can be controlled through a Garmin Edge 1000 or a Garmin Varia Remote. A Garmin Edge 1000 or Garmin Varia Remote can also control the pattern, intensity and onoff functionality of the tail light.