A lot has been written about this product and I have very little to add actually. Just sharing an experience I had with OnePlus last winter which impressed the hell out of me. So I was backpacking through Sikkim last winter with my friends who all had phones from HTC, iPhone and Honor. It was nearly -5 centigrade and all of their devices were draning their batteries pretty quickly but not Oneplus 3. So if are going to below zero degree area, I would suggest this product.