The vibration generator itself arrived OK but this is supposed to be a set which should include accessories. A wire hoop, a set of vibrating metal strips, a spiral spring, and an elastic cord SHOULD HAVE BEEN INCLUDED BUT WERE NOT IN THE PACKAGING. The only option I saw was to return it for a refund but it appears the price went up a little so, if I purchase a replacement which I will need to, it is going to cost me more and I will have to wait to get the replacement. This is a problem for me. I wish that I could contact Amazon directly and discuss options but there is no option to call someone directly. This is frustrating.The vibration generator itself is reasonably priced and feels solid (these a a common item in highs school and college physics labs) but it would help if the manufacturer included basic instructions with the unit.