How to use "shrill" in a sentence

Danny's cries and her response became increasingly shrill and desperate, for they knew that they must reach each other before nightfall or be lost forever; in the oncoming night, something waited for Danny, something fearsome that would seize him if he was alone after dark

Vivienne winced as the shrill electronic squeal grew louder, a piercing oscillation

Then the shrill noise abruptly stopped, and the digital display flashed with rapidly changing numbers