There is damage to the speaker terminals. Pioneer Pioneer AV Receiver Amplifier VSX-S510 Main unit Remote control Setup microphone Power cable (generic) This item was purchased used. Speaker output has been confirmed via external input, USB, and network. Network confirmation was only for server communication within the home. Network radio, etc., has not been confirmed. Radio has not been confirmed. Bluetooth and wireless LAN require a separately sold adapter. (Operation has also not been confirmed.) It can be used, but there is damage (cracking) to the front speaker terminals. There are scratches and stains. There may be other undiscovered defects. For those who understand the condition, Thank you.