Despite all the claims made about this device's capabilities, it definitely does not work.
I bought one for a family member who has an on-going snoring problem, so this seemed like a solution - not so.
After persevering with it for over two weeks, no change occurred.
Following the guarantee the entire purchase price would be refunded if total satisfaction was not achieved, I contacted them by email and asked for guidance as to returns should be made and when and how would the purchase price and cost of return be refunded. I used the email address supplied via PayPal.
I did not receive a reply, so I checked the email address which turned out to be same as the one I'd used and I sent a second email. That was over a month ago, and I have not had a response. That was in May, now in mid-June, I made an effort to contact them via their 'contact us' email facility on their website which promises a response within minutes, that was several hours ago.
The device is a waste of time and money, and the supplier is not to be trusted.
Bottom Line: No, I would not recommend this to a friend