The prongs are too wide and does not fit in the head properly. The manual one I have is much better than this as the prongs are not that far apart. I tried to fix it but it's not possible to adjust it :( Not happy with this purchase.
The massager is very hard to get the plug out to put the wires in. The product also was all worn looking like it was used but it was in a new package . And the massager is made for a mans head as I tried to use it and it can only use one sale side at a time
I bought it for my pregnant daughter who has been having migraines, unfortunately, it arrived broken and when her hubby attempted to fix it, it went from bad to worse. I'll just have to buy another and try again.