>>24 hours continuously >>Four alarm systems: power off alarm, pressure circulation fault alarm and compressor fault alarm, oxygen purity alarm >> AVG oxygen purity: 93% >> Low sound level: less than 48dB (A) >> Net weight: 19.2kg >> Strong ABS shell: Anti-aging, deluxe design. >> 1 year warranty for main machine, 5 years for compressor. Oxygen flow:1 -8 LPM Oxygen purity: 93% ±3% Operating temp : 5 C--40 C Operation noise(dB): 48dB A Power Supply:AC 220V±22V, 50Hz or 110V±10V /60Hz Power Consumption:540 W Output pressure:58.6 ±6KPa Equip. Classification:Class II Type B Dimensions(L W H): 43 cm x 32 cm x 62 cm