This portable tire inflator is lightning fast and takes just 90 seconds to inflate a medium-sized car's tire from 29 to 36 PSI. It can last up to 30 minutes of continuous use on a full charge. It has 5 preset inflation modes and 3 preset units with just one click. The price drops from $39.99 to $19.99 when applying the code "GMIARQXY" at checkout. Shipping is free.