I bought this product a few months ago, I had Sinus Surgery,so i needed this, ,worked just fine,but today April 23, 2023 it turned on by it self on my dresser,I thought it was a spirit, so i told it this house not b8g enought for the both of us,and i aint going nowhere,so i opened the door and told it to get out my house. okay went back and got back in bed. turned on again,ok took it apart,ok turned on again ok its runs by USB ,so ok I plugged it up the light came on showing it was charging,ok im yes,cause I just love this machine right,so i check on it charging,wow guess what it want come on at all and these Pulse aint cheap.so now I gotta contact AMAZON n the company..Thanks