Its highly accurate air pressure sensors mean no more fiddling with manual pumps. The digitally controlled air-pressure sensors improve inflation accuracy to ±1 psi, putting an end to back-and-forth tire pressure checks as you inflate. It also features preset tire pressures, for greater ease and peace of mind. The Xiaomi Portable Electric Air Compressor 1S automatically stops inflating your tires when your desired pre-set pressure is reached. It also remembers your pressure values, so you don't have to keep setting it up repeatedly whenever you use it.