1.1Real-time display of pressure, current and voltage. 1.2Real-time monitoring of over-voltage, under-voltage and over-current. Abnormal immediately alarm and display the corresponding error code. 1.3Four air pressure range free to switch. 1.4Automatic drainage reminder. 1.5Record running time. 1.6Two standard operating voltage(220V/110V) can be free to switch. 1.7Two pressure units(Bar/Psi) can be free to switch.