evo.com | Garmin Rear Lights > The Garmin Varia RTL515 Radar Tail Light is way more than just a tail light. A tail light lets cars know where you are, but it doesn't let you know where they are. This little radar powered seatpost accessory syncs up to your bike computer or smartphone to alert you when vehicles are approaching from behind. It's compact and easy to hook up, both to your bike and to your electronics. Plus, the light itself is excellent, providing a maximum of 65 lumens with four different modes and up to 16 hours of battery life. Maximum Awareness Varia RTL515 rearview radar provides visual and audible alerts for vehicles approaching from behind up to 153 yards (140 meters) away. Compact Easy-Mounting Design Easily mount this sleek, compact device on the seatpost of almost any road-use bicycle. The vertical design allows for better leg clearance and a perfectly comfortable ride. Lumens 20 Solid / 8 Peloton / 29 Night Flash / 65 Day Flash Solid / Peloton / Night Flash / Day Flash Battery Life (Hours) 6 Solid / 8 Peloton / 6 Night Flash / 16 Day Flash | Garmin Varia RTL515 Radar Tail Light 2025 in Black