Varia eRTL615 is a battery-free 24-GHz rearview radar that’s wired into an eBike battery via a compatible Garmin cable (sold separately), so it’s always ready to go. Varia eRTL615 has rearview radar that provides visual and audible alerts on your compatible device for vehicles approaching from behind up to 140 meters away. The device integrates with your select Garmin wearables, Edge bike computers or the Varia app on your compatible smartphone to provide alerts. Alert motorists to your presence as soon as possible with daylight visibility up to 1.6 km and a light-flash pattern that changes to alert the driver. Varia eRTL615 rearview radar features 4 light modes, including peloton mode, which provides a low-intensity flash that is kind to other cyclists’ eyes when riding in a group. The sleek and compact design offers multiple mounting options with a universal seat rail mount or a rack/pannier mount.