made in Germany modular components set up with O2-measuring sensor main power cable fixed to device low noise and high performance safe function technology microprocessor-controlled calculable follow up costs for maintenance and service Accessories operating manual coarse / dust filter humidifier at choice nasal cannula support for humidifier oxygen tubes 2m / 15m ?Technical data MDD classification II a Operating power 230V, 50 Hz Operating temperature operation + 10° to + 40°C storage - 20° to + 70°C Sound level < 45 dB (A) Power consumption 790 W Dust filter in the back of device Fine filter inside the device Fuses mains 2 x TT4.0A H 250 V internal 1 x T1.6A L 250 V Alarms (acoustic/ visual) low operating pressure, high operating temperature, power failure, system Status display O2-concentration Battery internal, 9 V, Type 6LR61 Weight 45 kg Dimensions (HxLxW) (54 x 40,5 x 51,5) cm without rollers/grip Manufact. warranty 2 years from date of purchase Oxygen performance rating up to 8 l/min 95% - 3% up to 10 I/min 92% +/- 3% up to 12 l/min 85% +/- 3% Flow adjustment 0, 1.5 to 12 l/min stepless