Export Country Europe, North America, South America, Middle East, Africa,Southern Asia, etc 1. Power System: 7.4V ,4400mAh Li-ion USB Power Battery Rechargeable. 2. Fast heating speed: within 3-5 seconds after working. 3. Temperature range: 40°C ~ 60°C(104℉-140℉). 4. 3 Heat levels - High, Medium and Low; Adjust temperature per your needs anytime. 5. Anti-Shrink, Anti-wrinkle, Anti-piling ,Breathable, Waterproof &Windproof, Lightweight 6. This product heating via infrared band 4-16um , help blood circulation, enhance metabolism, improve human immune function and relieve pain, make people feel very comfortable without any dry. 7. Products have far infrared detection and emission certification of harmful substances. 8. Can work in negative 40 degrees 9. Hand washing and machine washable optional after removing the battery 10. Built-in thermal protection module, five-fold protection. Safety Heated Vest.