HDD network audio system, 52W output, 4Ω speaker system. - Brand: SONY - Model Name: NAS-D50HD - Speaker System: SS-D50HD - Voltage: 100V - Power Consumption: 52W - Impedance: 4Ω Thank you for viewing. The above text was created by AI. I am listing this item because I have no user manual and will likely not use it in the future, so I hope someone interested will use it. I have confirmed that it powers on. The CD tray sometimes gets stuck when opening and closing. It played normally. One of the speakers has a dent (last photo). There is no problem with listening. Only the main unit and speakers in the photos are included. There is no antenna, so I cannot confirm radio reception. The system has been initialized. Please understand that this is a used item stored at home, and I look forward to your purchase. Thank you.