Nitelog® is a wonderful mobile companion for the Z1® and Z2® Auto, two of the lightest CPAP machines available. Use the app to control the Z1 or Z2 Auto, monitor sleep quality on beautiful charts, generate compliance reports and share data with your healthcare provider.At only 10.5 ounces, the Z1 and Z2 are great everyday CPAP machines that are also ideal for travel. Slip the Z1 or Z2 into the PowerShell® integrated battery and you have a full night of cord-free therapy. Enjoy!