A free-size cool vest capable of instant cooling and heating. - Model: PRO model - Functions: Instant cooling, instant heating - Temperature range: -28°C when cooling, 39°C when heating - Size: Free size - Battery: 20,000mAh - Accessories: Cooling pad, heating pad, connection cable - Brand: WindCore Thank you for viewing. Workman Peltier vest 2025 version. Although it has been used very little, it does not have a box. The battery is also in good condition.