After losing a silkie and being forced to care for a badly injured one, I installed a baby monitor inside the coop so I can hear anything that may be happening. This is great! I am sitting here listening to crickets outside the coop.....this thing is sensitive enough to clearly pick them up. It has a range of 400 feet, but I saw some with a longer range. I paid 20 bucks for it at Target. I got the model that also has little lights that flash wih the intensity of noise. That way if I don't want to have it turned up I can just watch for the lights. It also has a built in nightlight on the transmitter part (inside the coop) that lights up a corner with soft light. I can't believe I didn't do this sooner.