Please examine the item carefully and bid if you like it. It has been tested and confirmed to be working. The power supply is not included. Please make sure you are satisfied with the item before bidding. We are not photography experts, so please carefully review all photos before considering a purchase. We cannot answer inquiries regarding the purchase date or usage period of the item. We do not have knowledge of the product, so we cannot answer technical questions. Please make your judgment based on the product images. We are selling the item on the assumption that you will view all images. Feel free to bid. Our products are very satisfactory and useful.