【Safe and Eco-friendly Fast Heating】Our hand warmers are made of high-tech aviation-grade aluminum and ABS material, and certificated with UL, CE, and FCC with advanced safeguards defend against over-voltage, over-charging, over-current, and short circuits, making you and your loved ones safer and warmer.<br>【20 Hrs Long Lasting】Built-in rechargeable 2*3000mAh batteries supports handwarmers to work for 8-20 hours(depending on different heat level). No more longtime wait, quick charge only 3 hours. 4 levels indicator lights keep you informed of the remaining battery and heating status, say bye to the hassle of frequent charging and ensure you stay warm all day long.<br>【Portable 2-in-1 Pocket Size】Our rechargeable hand warmer is designed with magnetic attraction, it can be divided into two for independent heating. You can portable one in each pocket, or share one hand warmers with family. Its 0.62inch thick and 0.15 lbs weight, can easily fit into your pockets or gloves to take them anywhere.<br>【Perfect Winter Gifts】Our electric hand warmers are combination of fast heating, long-lasting warmth and stylish design, keep your hands warm throughout the winter. With exquisite package box, it is a must have warm gifts for Thanksgiving, Christmas, New Year, Birthdays Day gifts for children, friends, family and elderly.<br>【Instant Heat &amp; 4 Heating Temp】No more cold hands, our double-sided hand warmer quickly heats up to 105℉ only 3s. With 4 adjustable heating levels for both single-side and dual-side heating(Low temp:105-116℉/ Medium temp:116-125℉/ High temp:125-134℉/ Super high:134-143℉)for choice by your like. Our handwarmer is your warm companion in cold winter.