The sound signals coming from the speaker are quite unpleasant. An idiot tenacity column will tell you BATTERY LOW even when not in use. For instance, when I listen to a podcast at night, I switch off my phone and really go to sleep. Until BATTERY LOW! causes me to awaken in a cold sweat. Likewise with shutdown. When the speaker is not used for some time, it will certainly notify everyone around POWER OFF before it goes off! I'm not sure who thought of it, but it must be some sort of game.
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