This is a good portable tire inflator, powered by lithium-ion battery. You can use it to inflate car or bicycle tires, balls and balloons. Compared to a Stanley lead-acid air compressor, this compressor is very light and compact. It fits easily in your car's glove box. To charge the battery, you can plug it into any USB charging port on your iPhone or computer. The buttons on this little inflator make it easy to increase or decrease your desired target pressure. I would highly recommend it to any vehicle owner who wants to do their own tire maintenance.