Look for repellers with frequency above 25kHz. Most baby monitors operate below 20kHz, so this prevents any potential interference with nursery equipment.
Has anyone tried rotating between ultrasonic devices and natural methods? We use repellers for 2 weeks, then essential oils for 1 week to prevent pest adaptation.
Studies show human hearing sensitivity drops sharply above 20kHz. Even infants’ ears can’t perceive 22kHz+ waves, but pets like dogs may hear up to 45kHz - important consideration!
We placed our repeller in the hallway outside bedrooms. Catches pests moving between rooms without being too close to baby. Works great with door screens as secondary defense.
@SafeHomeParent That 10-foot rule is smart! I recommend keeping devices out of nurseries entirely during first 3 months when hearing is developing most rapidly.
We use diatomaceous earth in wall cracks + ultrasonic in common areas. Baby-safe and cuts pest traffic by 80% in our experience."
Not all repellers are equal! Cheaper models sometimes emit lower frequencies. Always check specs - quality devices should clearly state 22kHz+ operation for true baby safety.