Stay safer on the road with the Garmin's Varia RTL515. Unlike most taillights, the Varia has two main functions: a car sensing radar, and a safety tail light. The radar syncs with Bluetooth or ANT+ enabled Garmin devices and provides a visual and audible alert when a car is approaching. The taillight has up to one mile of daylight visibility and can be seen from 220-degrees, allowing drivers to see you well before the radar senses them. In its brightest mode (Day Flash) it produces 65 lumens and lasts up to 15 hours. With an improved mounting system, vertical design, and longer battery life, this light knocks its predecessor out of the water. With the Garmin Varia, see and be seen. This 3rd generation Varia adds Bluetooth connectivity, longer battery life, a new Varia mobile app & 3rd party app compatibility. Features: Vertical design Vehicle detection (140 meters away) 220-degree visibility Run time: 16 hours (Day Flash mode) 8 hours (Peloton) 6 hours (Night Flash/Solid mode) Modes: Day Flash (65 lumens) Night Flash (29 lumens) Solid (20 lumens) Peloton (8 lumens) Specifications: Brightness: 65 Lumens Battery Type: Rechargeable (USB) Run Time: 15 Hours (Max) Beam Color: Red Color: Black Weight: 70g Includes: Mounting system Charging cable Safety packet