I tried it on, but the size didn't fit, so I'm selling it. There was a small dimple on the Peltier element from when I bought it, but it doesn't affect use. The battery has been charged once. This cool vest uses four Peltier elements and can adjust the temperature to -23°C for cooling and 50°C for heating. - Model: PV555 - Size: L - Color: Black - Cooling Temperature: -23°C - Heating Temperature: 50°C - Number of Peltier Elements: 4 - Battery Capacity: 14000mAh - Input Voltage: USB Type-C Thank you for looking. Please understand that no returns or exchanges are accepted (3N).