... ., Ltd are devoted to development, manufacture and the export for high quality medical oxyen concentrator and oxygen generator all over the world. Specialized ... 2.Timing switch:setting runing time 30min,60min,90min,120min and automatic shutdown function 3..Alarm: Power failure alarm, High & Low ... alarm 4.Nebulizer(atomizer), with atomizer function 5.OEM welcome medical equipment oxygen concentrator