WindCore's cool vest with instant cooling to -28°C and heating to 39°C. - Brand: WindCore - Model: PRO model - Functions: Cooling and heating - Cooling temperature: Instant cooling to -28°C - Heating temperature: Instant heating to 39°C - Size: Free size (equivalent to S-L) - Accessories: Battery, controller, cooling parts Thank you for viewing. I have only used it about 3 times since purchasing. There is a scratch on the large fan, but I think it's in good condition. Please purchase only if you understand that it is a used item.