Finally got a chance to use this device. Manual was easy to understand. Charged rather quickly .I inflated a 325/17 tire from 22 psig to 32.5 psig in less than 5 minutes. The hose actually threads right on to the Schrader valve so you don't have to hold it in place. The unit shut off automatically at desired pressure. LED light is really nice as it points in the direction of the air hose and fitting and includes flasher and SOS signal functions. Also holds a charge as the fully charged light went out ust shortly before my tire was full, meaning there was sufficient battery to fill more tires. No doubt it would also serve as a battery back for other needs vis the USB port. Also included was a cigarette lighter power supply cord, a needle valve for filling sports equipment and bicycle tire adapter.