Well, after I was squeezed the envelope from the postman to the mailbox and thereby ruined initially I was skeptical. There is neither an instruction manual nor a cover letter. The Inlet of blister says something Chinese. Attempt makes clever I thought and after consulting with my friend a watchmaker and the first attempt was equally started. With the highest effort that part worked then halfway. Conclusion: I'm going to use it until the new watch comes closer and then it flies to the flea market. Who is young and athletic and everyday eating spinach to muscles as Popei to have well served, but for more than 40 years it is good not so much. TUD'm really sorry. I would have liked it rated differently but we want to be realistic and their spare you the trouble. Otherwise, fast delivery.