epgyn Rechargeable Hand Warmer, 2-in-1 5200mAh Reusable Portable Hand Warmer & Battery Charger for Skiing, Climbing, Hiking, Outdoors MUTIPLE PROTECTION: Apply liquid - free heating technology and premium battery cells without fear of explosion. It is aslo equipped a flame retardant inner shell and intelligent temperature control chip, so you don't have to worry about spontaneous combustion and over-heating. THREE MODES ARE AVAILABLE: As a hand warmer,It has a 3-second rapid heating system and three temperature modes, You can simply press the button to select the mode tha suits you t best. The first temperature range is about 35-42 degrees Celsius, the second is about 40-48 degrees Celsius,the third is about 48-55 degrees Celsius,and it lasts about8,6 and 4 hours respectively. SLEEK AND STYLISH DESIGN: The compact, pebble shape design and elegant color scheme show your personal taste and add vitality to your life. EXCELLENT FEEL: The sleek , matte texture design and great workmanship give you an excellent feel, and the double-sided heating warms your hands well. ULTRA COMPACT: One of the smallest and lightest 5200mAh portable charger. It has 5V/2A input/output. It can be fully charged within three hours and charge your devices fast.Compact pebble shape fits into pocket, easy to carry, great for indoors and outdoors activities.