Personally, I give it 5 stars because I paid a small amount (5 euros) and got this and it does the job perfectly for its price. Now, for those of you who are talking about build quality, etc., I will only say that for 5 euros, what do you expect to get? If you have high expectations, pay more and get something better that has all the features you want.

The construction feels fake and used, you have to press the button 10 times until you feel something and then when you realize it's doing something, it starts pinching.. I wouldn't recommend it.

In the end, it needs a damp towel between the neck and the device and it works fine

It has various programs with adjustable current intensity. The reason I don't give it 5 stars is because of the build quality, which I expected to be slightly better.