What's Included In The Box?The Garmin Varia RTL510 Radar Tail Light ships with the following items included:Varia 510Mounting KitCharge CableDocumentationManufacturer DescriptionSee and Be Seen, Day or NightProvides visual and audible alerts to warn of vehicles approaching from behind up to 153 yards (140 meters) awayTail light 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 vehicleSleek vertical design easily mounts to most road-use bicycles, including racing, touring and commuter stylesRequires a dedicated radar display unit or wirelessly integrates with compatible Garmin devices (sold separately)Battery life: up to 15 hours in flashing mode or 6 hours in solid or night flash mode 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 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 safer riding environment by alerting riders to vehicles approaching from behind. Green light? All good. Amber light? A vehicle is approaching. Red light? Take caution — a vehicle is approaching at high speeds. Ride safe.FeaturesPhysical 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+® • Water rating IPX7 • Viewing angle 220°r