Mouse repellents are designed to deter rodents from entering indoor spaces using non-lethal methods that target their heightened senses. These solutions typically fall into two categories: **ultrasonic devices**, which emit high-frequency sound waves inaudible to humans but distressing to pests, and **scent-based barriers** utilizing natural irritants like peppermint oil, balsam fir, or cinnamon. Unlike traditional traps or poisons, repellents focus on prevention and exclusion, making them a popular choice for homeowners seeking a humane, mess-free way to protect pantries, garages, and crawlspaces from unwanted visitors.