Looks and feels like a well made item. It works as described and only time will tell how long it lasts. Fully charged, added a presta connector, set the pump to 80psi and turned it on. Starting with a flat 28mm tire, it took about 90 seconds for the pump to stop. I connected my hand pump to a pressure gauge which I know to be correct and the tire pressure was 80psi. Excellent unit. I hope this lasts long.