I purchased Sony's Reon Pocket as a measure against heatstroke, but it also functions as a neck heater. I have two units, so you might find it useful to have a spare in case the battery runs out, or you could use the two neckbands to split them between two people. I have performed a basic cleaning before listing, and I will include two new silicone sheets as spares. For this listing, I have confirmed the connection to the app and the cooling function of both units, and I have also updated the firmware. There are minor scratches from use. I cannot guarantee a perfect condition, including the battery life. Please check the photos carefully and consider purchasing with the understanding that it is a used item. I may lower the price at my discretion, but please refrain from requesting a price reduction (instead, you can "like" the item and then suggest your desired price, and I will consider it for a day if the conditions are agreeable). Shipping usually takes about three days, but it may take longer depending on my work schedule. Thank you for your interest.