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The SiriusXM Onyx EZR has an inactivity timer that will power down the Onyx EZR after 8 continuous hours without any button presses. This feature is to prevent battery run down when the Radio is installed in a vehicle with an always on 12v power port that never turns off when the vehicle is turned off. However, this feature is off by default so normally your Onyx EZR will play without a time limit even if no buttons are pressed. You can turn this feature on and off in the Menu.
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