So we have problems with mice in our vent system, have cats and can't use poison because of said cats. Looking at other options but am wondering if anyone has any info about pest repeller things, the ultrasonic kind that emits hight pitched sound. I know it's not safe for rabbits and hamsters but that's all I know. Open to any other suggestions too. We also have bad issues with squirrels chewing into our house and can't use poison etc.