Fewer versions are equipped with fan and I am mentioning general mask. That fan comment is for additional info about other versions that are loaded with fan . 3-layers tech is used in their every mask . I haven't included app because it tells you the air quality and it is not connected to mask.
Secondly that maks is corrected after 5 minutes of publishing. However I used Steemit to edit.
And that link is of essential kit of which the mask is part. And necktube or scarves are secondary to it. So in my idea everything is good. If you still think that link is needed to be changed then comment me anytime. Thanks! I Hope it will get verified!