Meet the Varia Vision from Garmin: an in-sight display that turns your cycling sunglasses into smart glasses, providing you with navigation, performance data, and notifications on the road. You can pair it with a rearview radar system to get warning on traffic approaching from behind. The device has 8 hours of battery and an adjustable arm and eyepiece.
Vision has a weatherproof, lightweight design. It helps you stay focused while riding. It uses vibration alerts to get your attention. The product will ship in Q1 for $399.99.[Source]