Fast and Long-lasting Warmth : The power bank can heat up quickly in seconds; up to 8 working hours on a single charge. Keep your body and hands warm : 9 carbon fiber heating elements generate heat in the collar, mid-back and under two pockets for core body warmth. Three heat levels : 3 adjustable heat settings with a simple push of a button. Red is the highest grade (about 149), white is the middle grade (about 131), and blue is the lowest grade (about 113). Lightweght fabric : Made of 100% polyester,this weatherproof heated vest can withstand drizzling rain and snow without limiting your mobility when walking the dog or exercising outdoors, pair it with a sweater or jacket for colder winter days To keep you warm. Easy care : Supports hand wash and machine wash for easy maintenance every time you use it. Tip: The product does not include a power supply.