WORKMAN Peltier Vest PRO2 Special Edition With five Peltier devices, the cooling temperature has been further lowered, making it an upgrade from the previous model. This is a free-size cool vest equipped with instant cooling at -28°C, instant heating at -39°C, and 5-point cooling and heating functions. The Special Edition has sturdy stitching, and the heat exhaust fan lights up (Ice: Blue, Hot: Red). Also, the black Peltier devices are more efficient. - Product Name: WindCore ICE x HEATER Peltier Vest PRO2 special edition - Cooling Temperature: Instant cooling -28°C - Heating Temperature: Instant heating -39°C - Battery: 20,000mAh (included) - Adjustment Function: Dial-operated adjuster - Size: Free size - Number of Peltier devices: 5 All included accessories are shown in the photos. Worn only once. The vest has been washed, so please rest assured. It cooled very well and was a great help when used. I think it's a good product.