This neurotech device tracks brainwaves and oxygen levels to improve your mental fitness. I tested it to see if it's worth the $475 price tag.

For example, the Muse brain-sensing headband provides real-time neuro feedback that takes the guesswork out of meditation. So, what exactly does that mean? First of all, to use Muse, place it on ...

I tested the Muse S Athena, a $475 brain-training headband that combines EEG and functional near-infrared spectroscopy to measure brain activity and oxygen levels to give you real-time feedback.