This item was received from an acquaintance who closed their business last year. I lack knowledge of audio equipment and find it too much for home use, so I am putting it up for sale. It was used for about a year and a half (indoors) before I received it, and as a result, there are scratches, minor imperfections, dirt, and traces of tape. As for the operational check, I was able to play music via Bluetooth (smartphone connection) without any problems just before listing it. Please note that I have not tested the microphone connection using other jacks. [Included Items] Power cord, two speaker-to-speaker and Bluetooth amplifier connection shields (photo 4) Other shields that were included when I received it (photo 5) * There is no box or instruction manual. * There is no microphone. Please purchase only if you understand that this is a used item with a history of use and the above description. I will pack the item carefully as a novice, using cushioning materials as much as possible, so please understand that it may take some time to ship. Thank you.