The Garmin Varia RTL510 Radar Tail Light Bundle ensures you can see and be seen, day or night. Ride smarter and more aware with Varia™ RTL510 rear-view radar. Mounted neatly on the seat post, it provides visible and audible alerts for vehicles approaching from behind up to 140 metres (153 yards) away. Plus, the bright tail light is visible in daylight from up to 1.6 km (1 mile) away, so you can ride with confidence and peace of mind.Garmin Varia RTL510 Radar Tail Light Bundle FeaturesProvides visual and audible alerts to warn of vehicles approaching from behind up to 140 metres (153 yards) awayTail light offers daylight visibility up to 1.6 km (1 mile) away and is visible within a 220-degree range, so drivers can see you well before the radar sees the vehicleSleek vertical design easily mounts to most road-use bicycles, including racing, touring and commuter stylesRequires a dedicated radar display unit (sold separately) or wirelessly integrates with compatible Garmin devices1Battery life: up to 15 hours in flashing mode or 6 hours in solid or night flash modeThis sensor has your backWhile out on a ride, you have to keep track of everything. What’s your route, how far you’re going, how fast and how hard you’re going to push it. But with Varia radar along for the ride, it’s like having eyes in the back of your helmet. It’s essentially an early warning system so you see cars approaching from behind and ¬ they see you.Safety in numbersVaria™ RTL510 rear-view radar is just one part of cycling awareness. When paired with compatible Garmin devices the system helps to create safer riding conditions by alerting riders to vehicles approaching from behind. Green light? All good. Amber light? A vehicle is approaching. Red light? Take care — a vehicle is approaching at high speed. Ride safe.