This was the cheapest cordless tire pump I could find on Revain for $20. It's portable, although it has a significant amount of bulk, which might not be as convenient if you're carrying it on your bike. But it's quite convenient to inflate tires without having to search for an outlet or cigarette lighter. The display is a bit small, but the unit value can be chosen at will. The pump also has a pair of LEDs on the front that illuminate the area well. This worked really well for inflating bike tires and other small items. Fully inflates a bicycle tire in approximately 30 seconds to 1 minute. My only issue with this product is the battery, which can only inflate about 4 bike tires before needing to be recharged (and takes a few hours to fully charge). . Because of this, I suspect it will have enough power to inflate a car or SUV tire, although I haven't tried it yet. Overall I would recommend this product for the price. If it had more battery power it would be 5 stars.