So I bought this for my wife's car as I have a similar product I bought to make a bulky all in one jumper/compressor to replace. The other one I bought was highly recommended and reviewed and was maybe $3 cheaper than this unit. it's good here overall. I think it was easy to switch units to PSI by just holding down the "R" key. The switch is handy because you can choose to run it on battery power or draw power from the grid. Aside from the cheap feel, the real reason I didn't give it a 5/5 is the charging cable. I'm sure you can shop around and find a car cigarette plug that matches this amperage, but it only comes with the custom USB plug. The end that plugs into this device is a barrel-shaped connector with a male USB-A connector for plugging in almost anywhere. Why not just give this device a USB-C port, or I think I'd still be happy with the older micro-USB port as the charging port. Finally, while I like the compact size and all the cables for the cigarette lighter and air hose hidden underneath, there was no storage compartment for the included tips/adapters. IF there was a detachable panel at the bottom for cable management and air hose, you could place the tips there and not worry about losing them. The function seems good, but I didn't have to use it to inflate a completely empty car tire, just a quick inflation.
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