Specifications for the Used Respironics Evergo Oxygen Concentrators starting at $1800:

• Features:

  Easy-to-use touch screen interface controls all EverGo functions and clearly shows battery life and prescribed settings.
  Easy access to batteries makes them easy to change and charge
  Low Maintenance just one easy-to-remove filter for patients to clean.
  Non-medical design looks like an ordinary carry-on bag or camcorder case.
  Lightweight, weight less than 10 pounds.
  FAA - Approved for airline travel
  up to 12 hours of battery life from dual rechargeable batteries
  Can be charged with a wall outlet or car charger
  Oxygen concentrator can be used while charging
  

• Dimensions:

  6 in. (15.2 cm) x 12 in. (30.5 cm) x 8.5 in. (21.6 cm)

• Weight:

  8.5 lbs. (3.8 kg) with 1 battery, 10 lbs. (4.5 kg) with 2 batteries

• Warranty:

  Varies with Unit, Contact a sales person for speifics

• FAA Aproved:

  Yes

• Battery Charging:

  2-3 hours per battery from fully discharged to fully charged, depending on the power source and usage

• Battery Duration:

  Up to 4 hours with 1 battery (setting of 2 at 20 bpm)
  Up to 8 hours with 2 batteries (setting of 2 at 20 bpm)

• Flow Control Settings:

  Pulse Dose Settings: 1-6 in 0.5 increments

• User Interface:

  Touch screen, back lit LCD screen

• Noise Level:

  43 decibels typical

• Operating ranges, Intended for Use:

  Temperature: 41 to 104 F (5 to 40 C)
  Humidity: 15% to 95%
  Altitude: 0 to 8,000 ft. (0 to 2438 meters)

  
  

• Outlet Pressure:

  3 psi

• Oxygen Concentration:

  90% (+/-3%) @ all Settings

• Storage Ranges, Intended for Storage:

  Temperature: -4 to 140 F (-20 to 60 C), unit only
  Humidity: 0% to 95%, non-condensing
  Store in a Dry Environment

  
  

• Transportation:

  Keep dry, handle with care.