Is that a car coming up from behind? Maybe is a Chupacabra? With the Garmin Varia, not only will you be alerted its coming, but the built in camera will record it! With a long battery life (up to 6 hours using light and camera) the Varia can link to your Garmin device to give you warning of approaching traffic up to 459 ft. away. Keep youself safe out there folks.