Want to spend a warm winter? Looking for a portable and rechargeable hand warmer? Choose OCOOPA hand warmer, give you a warm enjoyment. <br><br> <b>One product, two uses</b><br> When you feel cold, you could use it as a hand warmer, fast heat both sides in one second, 3 adjustable heating modes for your choice, green and healthy heat transfer keeps you not feeling cold any more. <br> When your phone is out of battery energy, our hand warmer can work as a power bank and in this case, the indicator will be constant blue to indicate that the phone is under normal charging. <br><br> <b>Intelligent monitoring of battery capacity</b><br> Do you wonder how much battery capacity remains when you are using our hand warmer, just double-click the button, you can know the remaining battery capacity.<br> One blue indicator lights up - 0%-30% battery capacity left<br> Two blue indicators light up - 30%-66% battery capacity left<br> Three blue indicators light up - 66%-100% battery capacity left<br><br> <b> Bring it and warm your cold season</b><br> Built-in 5200mAh lithium battery. only 2-3 hours charging time can make sure 4-8 hours working time, it fully protects you from cold during your outing time. <br> Portable and compact. Pebble shape and small volume allow you to put it anywhere you want, hold it in your hand or put it in your pocket. When you are out for a camping or travel, you can also put it in your bag with its compact size. <br><br> <b>Product Parameters</b><br> Battery capacity: 5200mAh<br> Input: 5V/2A<br> Output: 5V/2A<br> Product size: L4.09*W2.11*H1.14 inch (104*53.5*29mm) <br> Product N.W: about 4.66 OZ.(132g) <br> Product G.W: about 8.29 OZ.(235g) <br> Charging time: 2-3 hours <br> Working time: 4-8 hours <br><br> Packing list: 1*hand warmer, 1*flannel bag, 1*charging cable, 1* user manual,1* USB-C converter, 1*certification <br>