This product is intended for those with the literacy to repair or maintain it. Please note that this item is sold as-is, with no returns accepted. This is a junk item: the discontinued STR-DG820. https://www.sony.jp/audio/products/archive/STR-DG820/index.html For a long time, I connected various playback devices and used it to power six speakers (Front L/R, Surround L/R, Subwoofer, Center), but there are some faulty switches on the front panel, so it is considered a junk item. Other important notes are as follows: ・Only the main unit, remote control, and instruction manual are included. There are no other accessories. ・The remote control is included, but I have not recently confirmed its operation. It may not work. Approximately 8.3kg SONY Multi Channel Integrated Amplifier STR-DG820 ※Returns are not accepted. Please understand that this is an NCNR (No Claim, No Return) sale. ※Please understand that this is a used hobby appliance stored at home. ※Cleaning was limited to wiping down the exterior. Deep cleaning has not been performed, so there is some dirt. ※Inspection is based on my personal opinion. I am being honest in my description, but there may be differences in individual perceptions, and there may also be oversights. Please examine the images and make your purchase accordingly. ※Shipping is from Okinawa Island. Delivery to your location may be delayed. Please understand this before purchasing. Thank you for your understanding. m(__)m