... is transported by vehicle or is in a place without AC/DC power supply.I.Features1,Long life piston cylinder ... while the unit is working or being attached to AC 100V~240V 50/60Hz or external DC 12V power ... 0.02MPa(150mmHg)~Max. vacuum3,Flow rate:≥20 L/min4,Jar capacity:1000mL (PC)5,Noise:≤65 dB(A)6, ... Operating voltage: DC 12V or AC 100V~240V, 50/60Hz7,Power input:110VA8,Battery duration ...