Start with sealing and sanitation. Mice already indoors need a removal plan too.
Repair small gaps with suitable retained metal materials. Keep ventilation and drainage working.
Place along active wall routes, follow instructions and check daily. Keep inaccessible to children and pets.
Frequent checks and professional welfare advice matter. Relocation does not repair the entry gap.
Peppermint smells strong to people. Lasting mouse control is uncertain, and concentrated oils need pet precautions.
Walls and furniture block ultrasound. Results vary, so treat devices as optional support and monitor fresh activity.
Seal, remove food access and address indoor mice. Get professional help for persistent activity.