If you prefer to start and stop the Z2 using the Start / Stop Button, you can disable the Auto Start / Stop Feature.
To do this press and hold the Up Arrow Button and Down Arrow Button at the same time until the Z-Breathe setting flashes.
Release the buttons. Then press and hold the Up Arrow Button and Down Arrow Button at the same time again until Auto on flashes.
Release both buttons and press the Down Arrow Button to change to off. Press and hold the Start / Stop Button to save the setting, you will the word ACCEPT.
To enable the feature, repeat the steps above, but press the Up Arrow Button to change to Auto Start/Stop and hold until you see the word ACCEPT.