Peltier element cooling vest with 2 fans, USB rechargeable. https://amzn.asia/d/hSmk4VM I took it out of the bag and checked the power and operation to see if it cooled as per the catalog. - Product Name: Cooling Peltier Vest - Function: Rapid cooling - Items included: Cooling vest body, instruction manual, charging cable, original box - Color: Black - Number of cooling elements: 2 large - Power: USB rechargeable 【Heatstroke countermeasures & equipped with two cooling plates & Peltier element vest】Equipped with an industry-leading semiconductor cooling system also used in small refrigerators, it instantly cools like having a cold can of juice against your back, providing a refreshing sensation! It transfers coolness to the skin in 3 seconds, and in my experience, I felt the cooling block was about 5-10 degrees Celsius after 2 minutes of power on. It is ideal for outdoor work during heatstroke alerts, as well as in kitchens and warehouses without air conditioning, where you can't escape the heat. The aluminum block dissipates heat and transfers coolness to the back, suppressing the rise in body temperature, making it comfortable in extreme heat. Wearing it as an inner layer for work clothes with fans is the best combination for heatstroke prevention and is recommended. Strong mode: cools up to -25°C from the outside temperature, operating time approx. 4-5H. Weak mode: cools up to -20°C from the outside temperature, operating time approx. 6-7H. Free size (equivalent to S~5L), unisex. I am selling it because I purchased a higher-end model, so please consider it. I will ship it within 24 hours as much as possible because the heat continues. Thank you for reading to the end.