Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesn't work as advertised

This inflator might be okay for bicycle tires and light duty small tires, but it does not work with larger inflation jobs at all, especially jobs requiring inflation pressures above 60 lbs psi. On my car tires, to raise the pressure from 35 to 40, it took nearly 10 Minutes per tire (that's 40 minutes for the car!!)! And on my truck tires, the unit would not inflate the tires about 62 lbs! It just kept running, with no increase in pressure. Do NOT buy this unit if you expect to use it regularly on car or truck tires.