Comes with lithium battery, inflatable without wiring. Accurate monitoring, tire pressure status, automatic display. There is a built-in intelligent sensor chip at the valve, which automatically detects and displays the tire pressure of the car when it is switched on. Healthy tire pressure does not require inflation, non-healthy tire pressure requires inflation. No need to watch, when the tire pressure reaches a healthy value, it will automatically stop inflation, and will not cause a tire blowout due to overcharge.