Features: Pressure range of between 3 and 20 cm H2OSmallest footprint of all leading CPAP devices with heated humidification system attachedAmong the quietest CPAPs on the market - only 26 DBACan be operated from a 12V DC source such as that found in a motor home (not with heated humidifier) and will switch automatically to AC power if connected and availableAuto-switching universal power supply of 100 240 V and 50 60 Hz, and automatic altitude compensation between 0 and 2750m (9000ft)Large backlit LCD and easy to follow patient menu