The HDM Z1 Auto Travel APAP Machine with Z-Breathe is an Auto CPAP machine that actually adapts to your breathing requirements thousands of times per night. By reacting to your requirements- rather than just delivering one constant pressure- the Z1 Auto delivers therapy at lower overall pressures and delivers a better, more natural breathing experience. The FDA testing revealed a sound level of 26dB using the standard testing methods although we have heard of slightly louder results from users. The Z1 Auto is the lightest auto-cpap machine weighting only 10 ounces. A free mobile app for data and remote control can be downloaded to a smart phone. The Z1 Auto cpap is data-capable and records all information on events and compliance. Download the free Nitelog™ mobile app for iOS and Android and sync directly to your device with Bluetooth®. Review your data or share it with your doctor directly from the app. Nitelog™ can also serve as a remote control for your Z1 Auto.