ZUZEE 3X Faster Tire Inflator, 150PSI Compressor

So, I compared this to a few other options around cyber Monday and this was the better deal and had more promises than the other similar products I was looking at. I'm going to skip doing a good vs bad aspects and get right to the two core problems I've experienced with this. 1) It's inaccurate. Compared to my tpms and digital tire pressure gauge, this reads +/-5 psi. It also is inaccurate compared to itself. One tire was a little low because the temperature dropped to around 40f. I set the proper inflation PSI and let it do it's thing. I watched for a while and the measured pressure didn't increase, then suddenly it turned off and the number changed to 3psi over target. When i double checked with my pressure gauge, it read 3 psi higher than what the pump reported. Out of curiosity I tried it on two other tires and got a mix of over and under shooting the inflation target. And over and under reporting the actual psi. 2) It's really not there for you in a pinch. Lithium polymer batteries significantly loose effectiveness closer to freezing temperatures. I left it alone in my car for a couple days, the temperature has been in the low 40's but hasn't reached freezing. One night i was outside doing some work in the dark and remembered that it had a flashlight feature. In deep darkness, it was hard to figure which button was the light. But it really didn't matter anyway, because the battery was dead. I had full charged it before initial use. It went down 1 of 4 battery level indications when i tried it out, and that was the end of what it could do. If i need it in a roadside emergency, i can't trust it to be there for me. I will be sending it back for a refund. I did not test it on smaller items such as ball inflation, but those are even more critical of +/-1psi, i personally wouldn't trust it for that, and at the price point, not worth holding onto for just that.