This is the first generation neck cooler sold by Sony. I will also be selling the neckband to hang it around your neck. I am selling this item because I purchased the latest version and no longer need it. Although it shows considerable signs of use, there are no problems with its operation. Please check the following website for detailed specifications. https://reonpocket.sony.co.jp/support/docs/RNP-1_StartGuide.pdf Included items: Box, power cable, instruction manual, etc.