Sports Sunglasses with head-up display
The Engo 2 is a lightweight pair of performance sunglasses made for endurance athletes, with a head-up display for the real-time metrics needed to improve performance. The metrics shown include heart rate, elapsed time, speed, power, distance, elevation, and more depending on the sensors you connect to it. You can customize the data you see using the ActiveLook app and even set up multiple screens and toggle through them with hand gestures like Ironman.
Data is displayed on the right side of the sunglasses using AMOLED projection. They call this ActiveLook 2.0 technology and it has a battery life of up to 12 hours while only weighing 36 grams (standard size). (There is no way to switch the display projection to the left side so if you're blind on the right side, this is not for you).
The lenses are made of polycarbonate, which makes it lightweight and impact resistant while providing 100% UV protection. The frameless design of the sunglasses means you get an unobstructive view of your surroundings.
The frame itself have thermoplastic temples and nose pads that can be shaped to fit you perfectly.
Third party sensors required
The Engo 2 itself does not have sensors to get all the data it can display. It simply displays them in a clear, non-obstructive way so you don't have to look down on your devices when you need to be looking straight ahead.
For the Engo 2 to work you need to pair it with your sensory devices via bluetooth. Using the ActiveLook app, which is compatible with iOS, Android, and Garmin Connect IQs, you can connect multiple sensors to the same sunglasses. For example, you can connect a heart rate monitor and the cadence sensor on your bike to the Engo.
Since almost everybody these days have a smartphone this should not a problem. The Engo connects to both iOS and Android smartphones as well as Garmin devices.