Purchased this unit used one year ago. I performed DIY maintenance, including internal cleaning, replacement of the CD pickup and CD tray drive belt with new ones, and greasing. As a remote control was not included when I purchased the main unit, I obtained a beautiful one separately. I was using it until last week, and there were no particular problems with the main unit's operation (CD playback, FM/AM radio, sound quality adjustment to left and right speakers, remote control operation). Please note that I have not confirmed the operation with external devices other than speakers and the remote control. There are no particular defects, but it is an old model (manufactured in 2003), so I would appreciate it if you could understand this. * No claims, no returns * Not compatible with overseas use * No price reduction The DENON UD-M31 is a compact audio system with a CD player and radio functions. The instruction manual is not included, but it can be downloaded for free from the internet. - Brand: DENON - Model: UD-M31 - Functions: CD player, radio, with remote control - Connection terminals: Optical digital, analog output, speaker terminals - Impedance: 8-16Ω - Color: Silver