I bought it just in in case I needed a jump, and no one was around with jumper cables. After browsing product after products, I found this multi-functional jump starter very interesting. So I bought this FNNEMGE jump starter and it exceeds my expectations. It charges my iPhone XR from dead to full in roughly 20 minutes, which is very impressive! It charges itself quickly thanks to USB-C fast-charging technology. Overall, this is a great buy and I recommend it to everyone.