Portable Rechargeable Round Electric Hand Warmers 5,000mAh

This Intelligent digital display, three levels of temperature control. Press and hold the power button for 2 seconds to turn the device on/off. The default temperature is set to 113°F. Press the button briefly to switch between 113°F, 131°F, and 140°F. Double-clicking the button in any mode will display the battery level. While charging, the digital display flashes to show charging progress. The display will show "100%" with constant brightness once fully charged. Great for use in the office or studio, indoors or outdoors. 3.5" Diameter x 1.38" Thick