Developers at Amazon's secret Lab 126 reportedly have been working on audio-only smart glass technology that would allow users to communicate with its virtual assistant Alexa. The smart glasses would connect wirelessly to users' smartphones and transfer communications through a bone-conduction audio system that would negate the need for headphones. Amazon plans to release the device before the end of the year. In addition to the eyeglasses, Amazon is working on a Web-based home security camera that would connect with its Echo smart speakers.