Didn't work for me -- returned
I was tempted by the low price, but the vibrating massage head would quickly (within 1-2 sec.) get out of alignment and go "cattywampus," which caused the vibration to become very painful and unusable.  Maybe it was just my unit, but the design or build is lacking, resulting in a failed product for me.  I'm sure the build will eventually improve and a solid company (Xiaomi?) will sell them and I will try again.
Rating: 1 stars