1、210 DEGREE SWIVEL: Electric heated ear warmer rotates 210 degrees for a snug fit, shakes wildly without falling off, and heats up quickly without the need to hold it in your hand. 2、ADJUSTABLE ANGLE: Electric heating ear warmer is warm and comfortable, safe and reliable, angle adjustable to keep your ears and face warm. 3、3 LEVEL TEMPERATURE CONTROL: USB heated earmuffs support 3 speed temperature control, conductive heat, built in heating element and graphite thinning sheet, three seconds of rapid heat warmth through the whole body warm up. 4、EASY TO WEAR: Electric heated earmuffs do not distinguish between left and right, can be worn on both sides, two rotating shaft design, can be adjusted according to different ear shape to wear left and right ear. 5、WIDE RANGE OF APPLICATIONS: USB heated ear warmer has a wide range of applications, can be used in winter, outdoor activities, cycling, skating and other occasion.