... had the trachea blocked, and for emergency treatment to a respiratory tract patient in hospital, first-aid teams, ... who is transported by vehicle or is in a place without AC/DC power supply.I.Features1,Long life piston ... while the unit is working or being attached to AC 100V~240V 50/60Hz or external DC 12V ... 1000mL (PC)5,Noise:≤65 dB(A)6,Operating voltage: DC 12V or AC 100V~240V, 50/60Hz7,Power input ...