Review on PRO Model Electric Air Compressor Portable Tire Inflator 12V/110V - Car & Bike Pump, Presta & Schrader Valve, Analog Pressure Gauge For Car Tires, Motorcycles & Soccer Balls by Scott Rao

I keep mine in the trunk and use it on a slow leaking tire once a week or so. I'm glad I have it and it works easily. It is slow (about 2 psi per minute), and noisy. Better than a trip to the gas station or a hand pump. Well-built with a nice case.