ANGELBISS Innovative Direct Plug-in Bottle System & Double anti-overflow protection system Run 3 hours without AC power FEATURES: Rechargeable DC 12V Ambulance car use DC 12V Fast recharge in 90 minutes, Continuous run 180 minutes (3 hours) Superior Lithium batteries Double anti-overflow protection system Direct Plug-in Bottle System, only one push to take out bottle 1400ml capacity suction bottle Innovative filter technology which prevents penetration of micro organisms and secretion into the device Only one inlet for suction hose, avoid misleading of air inlet and outlet Easy clean & sterilize & user-friendly operations