Know what's behind you before it arrives. The Garmin Varia Radar RTL515 combines advanced rear-detection technology with a powerful tail light, integrating seamlessly with your Edge bike computer or smartphone. The integrated radar continuously monitors approaching traffic, sending real-time alerts so you can ride with complete situational awareness. Its bright LED visibility extends up to a mile in daylight conditions, ensuring drivers spot you well in advance. Compact and universally compatible, it mounts effortlessly on virtually any bike frame. With up to 16 hours of battery life in day flash mode, you'll enjoy extended rides between charges. Whether paired with Garmin devices, the dedicated Varia app, or both simultaneously, this radar-light hybrid delivers the confidence that comes from seeing the road ahead—and behind.