Link: http://blog.testfreaks.com/review/review-of-sportiiiis-heads-up-display-for-athletes/
Quote: “Sportiiiis works in conjunction with ANT+ compatible devices to provide this data. The Sportiiiis attaches to any pair of glasses, sitting on the periphery of the users vision allowing full visualization of the road while providing continuous data. Two capacitive buttons on the unit allow the user to interact with the device with one hand. Besides visual feedback the Sportiiiis also provides verbal information. ”