900ml Hydrogen breathing machine advange: 1. Imported American DuPont platinum N117 proton membrane has a longer life than traditional membranes. 2.Medical, food-grade electrolyzer, more safer. 3.Aluminum alloy shell, more advanced, strong and durable. 4.Super large touch screen, ultra-clear display, real-time display of 99.99% hydrogen concentration, hydrogen flow and working hours. 5.Four automatic detection and alarm functions: Lack of water, over heating, high water level, water quality TDS Alarms, more convenient. 6.The interior is compact and reasonably designed, small in size, light in weight, equipped with universal wheels, and a pull handle, which is convenient for the elderly to move. 7.With child lock function, you don't have to worry about children touching it, making it safer to use. 8.One-button start, timing function, low-noise design, quiet sleep, time-saving.