We bought this specifically to pack in our 5 wheel van when we travel. It is advertised as a 150 psi pump. Our RV tires are rated at 110psi. One of the tires was low (99psi) so my husband tried pumping it up. After 5 minutes of pumping, the arrow did not move. After reading the manual, he claims it's a 100psi pump. Yes, Tyrewell, you have our money. I hope others read this and don't make the same mistake. TIREWELL 12V Tire Inflator - 150 PSI Heavy Duty Metal Twin Cylinder Direct Drive Air Compressor with Battery Clip and 5m Extension Air Hose ATV/Truck/Van/SUV