Pest control devices are not known to interfere with pacemakers or hearing aids since the frequencies at which they work are not high enough to cause interference with either medical equipment. There should be no problems because modern pacemakers were created with normal life in mind. Hearing aids, too, are designed to imitate the normal spectrum of human hearing, so if your hearing aid is working properly, you should not experience any interference. Devices are also safe for expectant moms because it is the volume or decibel levels, not the frequency, that can affect a baby’s well-being.