It is easy to use on the first sight
It is easy to use on the first sight, although product does not come with any manual or description.  However, there are parts missing. One metal screw and one metal bracelet that are supposed to hold the end and neck of the air blower so to adjust and release the pressure, they are not in the package.  The reliability of the product is much lower and may not last long due to these two missing pierces.  I checked the other reviewers and found out it is not just my case but rather complained by many.  Seller should NOT post product images with better parts but ship to customer different ones.
Rating: 2 stars