This is a really cool gadget, it is a hand warmer and a power bank and as a bonus feature, it also has a flashlight. I have been using the power bank every day since I received it. It small enough to fit in my pocket and it charges my phone pretty fast. It is a good hand warmer, it has two setting, to control the heat. It is a power bank 7800mAh Portable Charger for Phones & Tablets it also charges my headphone really fast. This is good to keep in your car so you can charge your phone on the run. I recommend this power bank with a flashlight and hand warmer for those cold nights.