Cool vest with instant cooling to -28°C and instant heating to +39°C, equipped with a 20,000mAh battery. - Model Name: WindCore X PRO model - Cooling Temperature: Instant cooling to -28°C - Heating Temperature: Instant heating to +39°C - Battery Capacity: 20,000mAh - Size: FREE SIZE - Included: 5 cooling/heating units - Adjustment: Dual rolling adjusters Purchased at the end of May. Used about 10 times. I believe it's still in good condition. I am selling it because it doesn't suit my work environment. There is a small dent on the plate in the fifth photo. Please refrain from purchasing if you are looking for a perfect item or are overly concerned about minor imperfections, as this is a used item.