Thank you for viewing. This is a full set, including one battery and support for 9 Peltier elements. It's a beautiful item, used only once for 3 hours. Perfect for this time of year. Please note that it may be removed suddenly as it is also listed on other sites. This product would cost over 30,000 yen if purchased. - Product Name: Peltier Cooling Vest Set - Size: 3L - Color: 90 (Black) - Materials: Mesh, Nylon, Polyester - Included: Cooling device, Instruction manual - Suitable Height: 175-185cm - Suitable Chest: 108-116cm