Model Number: TCS-1A-T Aiphone Intercom Set T-M-T Master Unit Model Number: TC-DE Sub Unit Model Number Description: Lightly cleaned. We have removed units that we confirmed were working, but we have not confirmed their operation after removal. Instruction manual, installation manual, and mounting screws are also included, so I think you can install and use it immediately. Because I am an amateur, there may be oversights such as imperfections, rust, and small scratches. Please refrain from bidding if you are nervous or concerned about minor details.