Excellent Gadget. I'm technically dumb and could still understand most of the instructions. I didn't understand the pressure preset, but luckily it defaulted to "auto" 33.5psi so I didn't have to figure it out. I inflated all 4 tires from about 24psi to 33.5 in about 10 minutes. on a single charge with a margin for battery life. It shuts off automatically when it reaches the correct pressure and the pressure is accurate (I checked with a separate tire pressure gauge). The connecting hose is a bit short. So if your valve stem ends at the 12 o'clock position you may need to hold the tip while inflating as it is not long enough to fully depress. All of this is neatly packed in a zipped case.
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