★ it is brand new , never open and use Timing Function: the Machine Will Automatically Turn Off, the Maximum Time Can Be Set 3 Hours/the Minimum 15 Minutes. Note: If You Do Not Use This Function, Please Turn Off the Timing ★ NEWER IMPROVED MODEL: Unique desing with Built-in Nebulizer; Running noise is less than or equal to 45 decibels; Intelligent time accumulation function: 0-180 minutes timer range, easy to record oxy time; Touch screen control and HD LCD big screen (for elderly to read), enhance working life and satisfied oxy absorption data viewing. ★ ADJUSTABLE oxy CONCENTRATION: supply continous flow 1-6L/min adjustable, provides a stable 93% (1L) pure oxy flow (1LPM: 90%±3; 2LPM: 75%±3; 3LPM: 60%±3; 4LPM: 50%±3; 5LPM: 40%±3; 6LPM: 30%±3) ★ DOUBLE oxy ABSORPTION FUNCTION: suitable for travel and home use. oxy tube purchase link: {url removed} ★ BENEFITS: Skin care, improves blood circulation, increases heighten concentration, alertness and memory, boost the immune system, lessens chronic fatigue syndrome, speeds up the body's recovery after physical exertion, helps to relax, natural remedy for headaches, migraines and hangover. ★ WARRANTY: 1 year warranty, if there is any problem, please contact DEDAKJ customer service