Garmin Varia is more than just a bike light — it’s a full-fledged early warning system. It significantly enhances road safety by alerting you in advance when a vehicle is approaching from behind. The detection range is impressive — up to 150 yards. This is especially helpful on highways and rural roads. Alerts are delivered both visually and through sound. The radar can connect to a bike computer or smartphone, allowing you to monitor your ride in real time