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I don't understand the 5 star reviews for this product. I got it yesterday and charged it. Took forever just to get the charge to two bars. It was enough to fill a flat tire on my car. I wasn't fond of the fact it measures pressure in bars but I can convert from psi to bars. I had it set to shut off when it reached 2.4 bars. It didn't. I finally had to detach it from the tire and hit the on/off switch multiple times to get it to shut off.I then charged it for about 8 hours and it finally said it was fully charged. Tried turning it on this morning, took about 10 tries to get it on. Used it on a bicycle tire. Again it wouldn't shut off by itself. I then attached it to another bicycle tire. This time it turned itself off before I could get it to attach. The tire was flat. I finally got it to turn on. It started and stopped about a dozen times, then quit. It turned off and now I cannot get it back on. It won't show charge when plugged in and the on button just does not turn it back on.I haven't returned a product to Amazon for defect in a long time, but this one goes back. I am so disappointed because I needed this for several bikes....but just cannot be trusted. Maybe mine just defective, or maybe this product is just badly designed, engineered, or built. I just don't know. But back it goes.

Bought 2 of these for convenience and to keep from starting the large noisy air compressor. Charged the 1st one and inflated bike tires. The modes control froze and the power switch failed. Set the unit aside thinking the automatic power off would kick in, it didn't. That was about 6pm it was still on the next morning. The 2nd unit's on/off switch worked intermittently. Not worth the money. Returning Both.

I charged the unit and went outside to test it. You can NOT see the display in daylight. I even went inside the car, got under the dash and tried to block light and still could not see it. Without being able to read the display you can not operate the unit so it is worthless.

Used it for my car,which due to Covid I hadn't used for quite a while and a couple of the tyres has gone really soft. This had happened to me before and I'd had to ring my Roadside Assistance provider. This device gave me more than enough pressure, although it took a little longer than I expected, to enable me to drive safely to the garage to check and inflate to the desired pressure.Very handy device to have in the house.

The worst product I regret buying.The real problem lies in the timing of the "air"...once it runs out (after one tire) you go back and recharge again.Don't waste your money on this at all!

This is the second time I buy this pump and keeps shutting off after the 2nd use. I let it cool down for half and hour and when I use it, it shuts off. Also didn't realize there are 2 versions of the pump that looks alike, Xiaomi air pump and this Imitation. 😳 I'll order the Xiaomi pump and hope it won't start acting up like the other two.

Es el peor producto que he comprado en amazon. No sirve para nada, es mas rapido inflar con la boca que con este aparato. NO lo recomiendo es muy malo.

Can’t turn it on. Too about 5 minutes to get it to work. Don’t buy this product