Switching between noise cancelling off, aware, and noise cancelling on was amazing. I could hear the Roborock and air purifier fan running in the background with noise cancelling off, hear them louder in aware mode, and hear their sound disappear completely with noise cancelling off. This will be great for mowing the lawn (blocking the tractor's noise) and be able to hear traffic or other things while walking the dog.
It keeps desyncing, clicking and gliching if the charge is below 60%. The problems start slow, but escalate to a level where the audio is unrecognisable. Don't buy this!