audio-technica Wireless Neck Speaker AT-NSP300BT https://www.audio-technica.co.jp/product/AT-NSP300BT I am selling this because I purchased other headphones. I used it occasionally, so there is some minor dirt. I have never experienced any operational problems. It charges properly. I have the instruction manual and warranty card, but I do not have the packaging box or USB cable. Also, the warranty card is not valid as it has been over a year since the purchase. Price reduction! (January 10th -) 4200 yen -> 4100 yen Thank you for looking.