When I got it & plugged it in it gave me problems like it would come on then just go off. Then it got to were it only come on at the low setting & when I would push the button it would go off. They told me to change the USB cable. Tried that didn't work so I changed the USB adapter & that worked, but they didn't say if they would send me a new adapter. The one I'm using goes to my phone. I wish they would have offered to send me a new USB adapter.