If you set up an alarm when the Reason ONE clock is still connected to the Internet and Alexa is enabled, the alarm will still go off even if the clock becomes disconnected. However, to stop the alarm, you'll need to manually short-press the top button one time, because the clock will no longer respond to voice commands. If you try to use an Alexa voice command without Internet, the clock may get stuck on the "blinking eyes" animation on the clock face. To get out of this animation, you'll need to short-press the top button one time. Then press it one time again to turn off the alarm. In sum, Internet access is necessary for the clock to function normally.