See & be seen, day or night: Provides visual & audible alerts to warn of vehicles approaching from behind up to 140 metres (153 yards) away Tail light offers daylight visibility up to a 1.6 km (1 mile) away & 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 & commuter styles Requires a dedicated radar display unit (sold separately) or wirelessly integrates with compatible Garmin devices 1 Battery life: up to 15 hours in flashing mode or 6 hours in solid or night flash mode Ride smarter & more aware with Varia™ RTL510 rear-view radar. Mounted neatly on the seat post, it provides visible & 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 complete confidence & peace of mind. This sensor has your back While out on a ride, you have to keep track of everything. What’s your route, how far you’re going, how fast & 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 & they see you. Safety in numbers Varia 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. Specifications: Dimensions: 98.6 x 19.7 x 39.6 mm Weight: 71.0 g Modes: solid, night flash, day flash Lumens: 20 solid, 29 night flash, 65 day flash Battery life: 6 hours solid, 6 hours night flash, 15 hours day flash ANT+®: yes Water rating: IPX7 Viewing angle: 220° In the box: Varia RTL510 Radar display unit Mounting kit Cables Documentation