Workman WindCore PRO 2025 model cool vest with instant cooling to 28°C and heating to 39°C. I used it three times after purchase, but I no longer need it, so I am selling it. The vest has been washed. The Peltier element has been disinfected with alcohol. The battery is included. However, the instruction manual is missing. The QR code on the back of the box contains usage instructions, so please refer to that. I will ship it ready to use upon arrival. I am looking forward to purchases from those who understand that this is a used item. - Model Name: WindCore PRO model - Cooling Temperature: Instant cooling to 28°C - Heating Temperature: Instant heating to 39°C - Battery Capacity: 20,000mAh - Included Items: Charging cable Thank you for viewing.