It worked. The user manual is not very good. It is too early to say anything about the result, I hope it will be good.
The power supply is not capable to give enough power, fortunately I have a better one so I'm using that.
I can't believe the quality and value of this belt. I bought it as a present for someone with a bulging disc. After only 3 weeks of use they are reporting less back pain and find it very comforting. They are recommending this belt to everyone.
Buyer 
Claire 
