1 High oxygen purity 93%+-3% from 1Liter to 5 liter 2.Comes with overload protection system, which can protect machine if meet high voltage. 3.Timing function, can setting up working time:30mins,60mins,90mins,120mins 4.Automatic Alarm function :power failure alarm, low voltage alarm, low purity alarm(Optional). 5.Available comes with nebulizer function. 6.Use France imported CECA molecular sieve 7.Long life time, more than 16000 hours الحالة جديد