Doesn't press properly. To get 10psi of air I had to set it at 25psi and it still shut off early. I had to keep turning the power on and off because it kept turning off, thinking it was up to the pressure required. I don't mind the hiccups, but that's kind of the selling point of this device, and it doesn't work. Update, had to use it because a roadside flat in my car kept overheating and shutting down. Couldn't inflate tires. It barely worked for bicycle tires, I don't know why I'm surprised it's reached its mechanical limits in a car tire. Update #2: I tried using this again on a lawn mower tire. It was shut down in the middle of inflation, no power. Thinking that a fuse might have blown, I moved it to the new power connector. Worked for a few minutes, turned off. The same thing. I checked the fuses, none were blown. I unplugged the power adapter and it was boiling hot. He managed to melt the plastic in both sockets, which prevented the fuse from touching the back of the connector. This messed up both power connections. I have no idea how he made it without blowing one of the fuses. This thing is a fire hazard. I threw it in the trash can. DO NOT BELIEVE THIS DEVICE!
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