Echo-location works like this. The bat sends out pulses of a high frequency sound. The sound the bat sends out bounces off the prey and the sound waves go back to the bat. The bat reads the sound and can tell where its prey is and then eat it. Bats are not deaf.
People only invent myths about bats to scare other people.
Bats don't have rabies and they can't turn into vampires. They don't mean any harm, but when they are flying around in a room th ey only want to find an exit. Bats are good. Without bats the world would be filled with deadly bugs and big mosquitoes that can kill you. In the winter when it gets cold, bats either hibernate or migrate.