Apple devices play a distinct low battery warning when power runs low during an active phone call, a situation where the usual on-screen alert is less visible to the user. Because the tone is tied to a moment almost every iPhone and iPad owner recognises, short clips of it have circulated online as a reaction sound for anything running out of charge, patience, or time. Editors tend to use it ironically, letting a familiar system sound stand in for exhaustion, a deadline, or a conversation that cannot continue for much longer.