The Z2 Auto is an ultra-small, light weight, full featured Auto-CPAP machine perfect for travel and home use. Z2 Auto adjusts pressure levels on a breath-by-breath basis to deliver successful sleep therapy at the lowest, most comfortable, levels possible. With a host of features -- like Z-Breathe Expiratory Pressure Relief, an adjustable ramp, auto start/stop, and a whisper quiet motor -- Z2 Auto is the ultimate CPAP solution for travelers and people with an active lifestyle.