Earshot (noun)

1. The distance or range within which something can be heard.
2. The distance or range within which a person or group can hear what is being said.

Origin:

From the phrase within earshot.

Examples:

1. He whispered to her, not wanting anyone else to be within earshot.
2. She talked in a low voice, so that her words would not carry beyond earshot.
3. He was careful to speak softly so that his words wouldn't be heard by anyone outside of earshot.
4. They had a private conversation, making sure that nobody was within earshot.
5. I could hear the noise from the street, but the conversation was not in earshot.