Garmin Varia RVR315 Radar

With the Garmin Varia RVR315 Radar, you'll always know when vehicles are approaching you from behind. This way, you won't be surprised when a fast moving car is overtaking you. Connect the radar via Bluetooth or ANT+ to your Garmin Edge bike navigation and smartphone. You can read notifications on the screen of the radar during your bike ride. The radar is rechargeable and has a battery life of up to 7 hours. It's also waterproof. With the included mount, you can attach the Garmin Varia to your seatpost.