In the Box Bundle Varia RTL510 Radar display unit Mounting Kit Cables Documentation Non-Bundle Varia RTL510 Mounting Kit Cables Documentation Ride smarter and more aware with Varia RTL510 rearview radar. Mounted neatly on the seat post, 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 peace of mind. This Sensor Has Your Back : When out on a ride, you have to keep track of everything. What’s your route, how far are you going, how fast and how hard are you 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 Numbers Varia RTL510 rearview radar is just one part of cycling awareness. When paired with compatible Garmin devices, the system helps to create a safer riding environment by alerting riders to vehicles approaching from behind. Greenlight? All good. Amber light? A vehicle is approaching. Red light? Take caution — a vehicle is approaching at high speeds. Ride safe. Features productSpecMisc Physical Specifications Dimensions: 3.9” x 0.8” x 1.6" (98.6 x 19.7 x 39.6 mm) Weight: 2.5 oz (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°