Amazon's Alexa-powered smart glasses are now more widely available

Last year, Amazon announced Echo Frames, which are almost exactly what they sound like -- a prescription-ready eyeglasses frame that looks pretty standard but has built-in microphones for you to summon Alexa. They were announced as a "Day One" product, made in limited quantities and only available via a special invitation. But now, a little over a year later, Echo Frames are available to anyone who wants them. As the first Day 1 item graduating to a full-fledged product, Amazon has made a bunch of improvements to these new Echo Frames. The first model had open-ear speakers where you would hear replies, and the new model can automatically adjust volume based on how loud your surroundings are. Amazon also says battery life is up to 40 percent longer (during continuous playback at 60 percent volume).