Features:* 1. Multiple heating zones and 3 temperature adjustments: Carbon fiber heating elements generate heat on the waist, stomach and upper back; one button for 3 heating settings. * 2. USB charging: easy to charge. You still need to connect the 5V2A mobile power supply (this product does not include the mobile power supply). Mobile power should be removed while washing. * 3. Safe and healthy: only 5V far infrared heating, far below the human body safety voltage of 36V. Stable heat and bodily safety voltage. Suitable for better warming of abdomen and waist. * 4.Large area heating: The electric heated vest has many built-in heaters, which have blood circulation and heat function, which not only warms your belly, back, waist and abdomen, but also promotes blood circulation. * 5. Wide range of applications: This heated vest is ideal for outdoor skiing, winter fishing, mountain biking, cycling, camping, snow hiking, hunting , outdoor attendance, winter street, daily office, etc. * 6.