When I opened this product I examined the list of items it should have contained. This included a detailed instruction book and a quick guide. My product contained the quick guide but no instruction book. There was also no guarantee document. I did manage to work the machine but it is quite limited in what it can do. It is really only capable of relaying a telephone call to or from the smartphone and telling the time. It would be useful if one could only hear it, but although the person at the other end of the conversation could hear me, I could hardly hear them, and in the quick guide there is no hint as to how you could make it louder. Perhaps, if I had been supplied with the instruction manual, it could have given me assistance in increasing the volume.
However it is almost entirely useless as it stands, for in order properly to hear a conversation, I have to put it right up against my ear a contortion which is not easy if the watch is attached to one's wrist. I appreciate that this is a very cheap item, but even cheap items should serve some useful purpose.