Garmin Varia RTL510 Rearview Radar Tail Light with Display Unit: Black

Ride smarter and more aware with Varia RTL510 rearview radar. Mounted neatly on the seatpost, it provides visible and audible alerts for vehicles approaching from behind up to 153 yards (140 meters) away. Plus, the bright tail light is visible in daylight from up to a mile away, so you can ride with confidence and security.

Provides visual and audible alerts to warn of vehicles approaching from behind up to 153 yards (140 meters) away
Taillight offers daylight visibility up to a mile away and is visible within a 220-degree range, so drivers can see you well before the radar sees the vehicle
Sleek vertical design easily mounts to most road-use bicycles, including racing, touring and commuter style
Battery life is up to 15 hours in flashing mode or 6 hours in solid or night flash mode
Dedicated radar display unit included