There are now a number of ebikes equipped with radar systems which warn riders of vehicles approaching from behind. If your bike isn't among those, you can now change that by slapping on Garmin's Varia eRTL615 radar/tail light module.
Battery-free 24 GHz rearview radar and tail light for compatible eBikes (requires compatible Garmin eBike cable; sold separately) Radar detects
Garmin Varia eRTL615, Rearview Radar and Tail Light, Powered by Your Compatible eBike, Visibility up to 1 Mile Away
Garmin launches e-bike specific radar light - the Varia eRTL615
Battery-free 24 GHz rearview radar and tail light for compatible eBikes (requires compatible Garmin eBike cable; sold separately) Radar detects
Garmin Varia eRTL615, Rearview Radar and Tail Light, Powered by Your Compatible eBike, Visibility up to 1 Mile Away
Garmin Ltd.: Garmin unveils Varia eRTL615, its first rearview radar designed for your eBike - MoneyController (ID 1315037)
IN THE BOX: 1x Garmin Varia eRTL615 (direct rack mount), 1x 2-bolt to friction flange mount adapter, 1x seat rail mounting kit, 1x Wearable4U E-Bank,
Garmin Varia eRTL615 eBike Rearview Battery-Free Radar with Wearable4U E-Bank Bundle
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Garmin unveils Varia eRTL615 a rearview radar for your eBike