My car's tires lose air when the temperature changes. So I constantly have to find a pump. The gas stations near me either charge for the air pump or the free pumps "fail". This portable pump really solved my problem. You no longer have to drive to the gas station to inflate your tires. It also comes with a print reader! This is very useful as free pumps at gas stations usually don't have pressure sensors. Definitely worth the money and saves me a lot of trouble. I have a Sonata, the electrical cord is long enough to run from the DC connector on the center console to the rear wheels. If you have a big car you need to make sure you have a DC power connector from the trunk. The advantage of this thing is that you can use it to inflate pool loungers and even air mattresses. It is very convenient when you go to nature or hiking.