Fruitbats are noisy af, you can hear the beat of their wings as they fly over or when they're squabbling in the trees. The smaller bats I hear when they're echolocating to catch the insects that flock to the lights around my apartment complex, it's like a short sharp tsk tsk/tsp tsp.

Edit: it's this species which is audible to humans white striped freetail

Edit edit: i hope you can research and find a species that lives near you. Happy bat hunting :)