Horses have an extremely good sense of hearing.
Little is actually known about how they hear, but it is suspected his hearing is more similar to, than different from our hearing. Humans hear a range of sounds from 30 to 19,000 hertz. Horses can hear a range of 55 to 33,500 hertz. So a human can hear a few lower sounds, but horses hear many more sounds through the higher frequencies. While their hearing is very sensitive, it is not very precise.