Welcome! I am unsure of the usage period or frequency. *Please check carefully as items not listed are not included.* Included items: Main unit only Condition: Basic functions other than recording have been confirmed! There are minor scratches, etc. We have cleaned and disinfected as much as possible. *We are also listing on other sites, so please confirm with a comment! Also, this page will be deleted once a deal is made.* #Sony #MD #MD recorder #MD player