How to Say "beeping" in Spanish
The Spanish word for “beeping” is “llamando” — B1 level.
English → SpanishB1
VerbB1
for attention

Examples
Oigo ruido, alguien está llamando a la puerta principal.
I hear noise, someone is knocking at the main door.
La ambulancia está llamando la atención con su sirena.
The ambulance is drawing attention with its siren (by calling/sounding the alarm).
Knocking vs. Phoning
When 'llamar' means 'knocking,' it almost always needs the little word 'a' (like 'at' in English) before the thing being knocked on: 'llamando a la puerta'.
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