Garmin has introduced the Varia eRTL615 as its first rear-view radar specifically designed for e-bikes. It can detect vehicles as far away as 150 yards (or 140 meters (m)), to alert the rider in a number of ways, smartphone alerts included. The latest Varia-series device also integrates a tail-light with four different lighting patterns, and plugs directly into a compatible bike for battery-independent power.