The AirMini AutoSet Travel CPAP Machine is the smallest ResMed machine available today, weighing only 0.66 pounds. This small CPAP uses a small 20W power supply to further minimize the size of the travel unit. Pair the machine with the AirMini by ResMed smartphone app to track therapy and adjust machine settings.Unlike a traditional humidifier which requires distilled water, the HumidX is a small disc about the size of a quarter that's inserted into your AirMini’s short tube. HumidX utilizes patented technology that reuses moisture from your breath to add humidity to your therapy air. Waterless humidification makes the AirMini more portable than your home unit and opens up tons of possibilities for exploring new places.