One of my car tires keeps losing pressure and I'm tired of going to the air pump every other day. Since I've had this tire inflator I've never seen or spent money on a pneumatic machine. I always have it in my car, and because it's portable and lightweight, I can inflate a tire anytime, anywhere. It came fully charged and I haven't even had to charge it until now. The 2400mAh battery lasts a long time and is great. So this is a very powerful and useful device to have with you when you drive a car, bike or motorbike.