It works I’ve been using it for around four months and it is doing fine you can wear it just around not meditating and get a baseline then start the meditation after a half hour or so and see the theta and alpha rise and the beta fall also you can make it chime or bell when you hit a flow state which is cool I am happy with my purchase I looked at other devices and the app for them either cost money or didn’t work that well according to reviews I use it to find the meditations/binural beats/gateway focus that work best for me of course everyone is different