The Invacare Stratos Portable Plus is a sleek new portable compressor that will offer speed ease-of-use and stylish design in one compact package. Small enough to fit in the palm of your hand it will be ideal for those who desire mobility expediency and efficiency in an aerosol delivery device. Features: Mobile - small size quiet operation and battery pack (sold separately) will allow the unit to be used almost anywhere Economical - premium product that is priced to fit the needs of the managed-care market. Flexible - can be powered using the AC power cord in a wall outlet using the DC adapter in a car or using the optional battery pack. Powerful enough to drive a standard nebulizer. Three year limited warranty - UL listed