Put it at the head of a reaction beat, before the spoken line it cues, then follow the exchange with a censor beep for a bleeped reply or a ding sound effect to close the bit cleanly for viewers.
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This is the half-second electronic chirp from Nextel phones using Direct Connect push-to-talk, a clipped high beep that signals a transmission is starting. It feels urgent and playfully retro, instantly turning a normal moment into mock radio chatter. The tone became widely recognized in the 2000s as the walkie-talkie feature spread through workplaces and everyday phone use.