The loud *chirp* sound made by these nextel walkie talkie phones. : r/nostalgia
It's no accident that Apple chose a yellow icon for its walkie-talkie feature. I dug out my old (2002ish) Nextel with PTT (push to talk). It was all the rage back then... :
TOAN MAGAZINE — Throwback Thursday: Nextel/Boost Mobile Chirp...