Review on 🚗 fineed Portable Air Compressor Pump: Reliable 12V DC Hand-Held Tire Inflator with 150 PSI, USB Rechargeable, and Digital Pressure Gauge - Ideal for Car, Motorcycle, Bike, and Toys by Darius Newberry

It took a few tries to figure it out but it works great. Set the desired pressure, turn it on and wait for it to turn off. Observations and Conclusions: 1. Connect the tube to the air shaft you are inflating. When you have set the desired barometric pressure, flash the display four times (until it stops flashing). Then press the power button TWICE to start the compressor. Refresh: Or press "Unit" key to set the target, then press Power once.2. For the first time, I worried about the display showing the rapid growth of the numbers. It turns out that during this stage the gauge is counting seconds - how long it takes to complete the process, rather than barometric pressure. phew Update: The numbers can be cycled through elapsed time or current inflation value.3. I fully charged this item the first time I opened it. I inflated two tires on a handcart and two bikes that were completely flat. The fee expired on the fourth bicycle tire. So I got almost six tires on one charge (35-75 psi each).4. It's a lot easier than carrying things to the gas station or pumping by hand. I like it more than the previous device I used.5. Inflating the tires does not take long. About a minute.6. Note that the STEM will get very hot during use. It got hotter and hotter with every tire pumped up. I was very pleasantly surprised that there seemed to be no air loss when I disconnected the stem from the tire valve stem. It is a compact and relatively lightweight device. So far very satisfied.