We are offering low noise oxygen concentrator. this ultra-quiet 5l fda approved oxygen concentrator offers more peaceful nights and 24-hour service for the home-care patient. oxygen purity ≥ 93% @ 5l displacement 5 lpm @ 0 kg/cm2 power (max. Watts) 120 sound levels (dba) ≤40 weight (kg) 15.2 size (lxwxh) 370 x 330 x 580mm cord length (m) 2 electrical requirements 115v±10%/60hz or 220v/50hz or 230v/60hz service-free life 2 years or 8000 hours.