Purchased in early 2025. Used a few times to add microphones in a karaoke box and then stored. Before listing, I connected a microphone and confirmed that sound was produced. The original box will be shipped inside another box. Please do not purchase if you claim "there are scratches or stains not mentioned" or "it doesn't work in my home environment" and demand the same quality and support as a new product. (As this is a low-priced, used item sold by an individual, I will not address any operational issues, including those suspected to be caused by shipping problems. If you require a guarantee of operation, please do not use Mercari and purchase a new product from a business.) Returns are not accepted to prevent changes in condition or swapping after purchase. Price reductions, individual sales, and dedicated pages are not supported.