Nice unit, knobs all turn freely...selling as found as is...Thanks for checking out my store! I buy abandoned storage lockers and research as much as possible on the item, but I am not a professional on everything I sell, if there is something special you need to know about this just send me an email and I will promptly answer your question, if it is an electronic device that requires testing and you know how, just let me know and I can test the item for you.  Fast and safe shipping is my priority! Just check my feedback comments. Thank you for checking out my store Blacktop Swap, with my purchases of these storage lockers I am able to pass the treasures and savings onto you! Feel free to email me with any questions or tips! Good Luck at the Auction!