1-5L adjustable, Flow rate 1 L concentration 90% ± 2%, flow rate 2 L concentration 78% ± 2%, flow rate 3 L to 4 L concentration 50% ± 3%, flow rate 5 L concentration 30% ± 3%This unit has a timer function (2 hours), and the sleep mode keeps quiet during sleep at night without generating excessive noise, so you have a comfortable and quiet sleeping environment.
With time setting function,AC 110V(not battery powered).It works with or without water, no need to refill at night