I have used such and have reservations about how effective it will be. With the exception of raccoons in a group, you are unlikely to hear the predator itself. The raccoons talk to each other a lot, but the sounds are not of the type that wake me from a sound slumber. In most settings, the first sound you will hear is the distress call of a chicken as it is captured. If predator is raccoon or opossum, you will hear screaming from the victim that will last from a few seconds to minutes. If the chicken is screaming, more likely than not, it is being harmed in a grievous manner. If a fox is involved the sound production will very short indeed as fox dispatched chicken; I have heard that several times in recent years. If owl, then chicken will make a muffled squawk before death. Owl is a critter that promotes sound from birds not being directly attacked, assuming chickens can even see shadow of the owl.
I suggest you couple use of baby monitor with a nightlight so chickens can see predator and produce warning calls before contact is made. The chicken warning calls are much more likely to wake you up and gives more time for you to act.
All this for not if you do not respond quickly enough. I have a fully charged flashlite over door I run out. Do not take time to fully dress, slip running shoes on and hall butt with flash lite and possibly a weapon. I have used a light rifle, but found that approach is seldom the most effective because you will not be able to get a shot off. Running with a rifle is not always smart, especially when loaded. What seems to be optimal for me is a wooden baseball bat. I have struck raccoons and opossums, those where exceptions. The bats can be used to make noise as you approach and can be used to easily dispatch in the event you get lucky and close enough.
Treat this sort of approach as a stop-gap measure only until you can get location birds are kept in more predator resistant.