Yamazen Water Cooling Vest New, unused, but the package has scratches, dirt, and peeling. When inspecting the contents, I slightly tore the instruction manual. The main unit is fine. The battery only lasts about 2-3 hours even when new if you use the water cooling circulation at full power (AC adapter not included). It doesn't cool down at all unless you use it at full power during the hottest part of summer. You can easily replace the cold water, but the battery takes 3-4 hours to charge. It's completely useless in 2-3 hours. That's not practical, so I'm including a spare genuine battery (for a total of 2 batteries). With this, it will last about 5-6 hours. You can also charge your phone when you're not using it. Please refer to the photos and comments for details. There is also a used item, but it doesn't have the package box (this one also comes with one spare genuine battery, for a total of 2 batteries, please make sure you understand). It has been used once but is almost new. The vest has been cleaned, so you can use it immediately upon arrival. Shipping included, 10800 yen. Please contact me. Both do not include an AC adapter, only the cord to connect to the battery. Hot days will continue, please consider.