The design and performance of the KETCH-ALL has earned it the title of "The World's Best Mousetrap." The KETCH-ALL operates without the use of harmful chemicals, making it safe to use around children and pets. It is efficient, often capturing several mice in one setting! The KETCH-ALL has been winning the war against rodents since 1924. It works 24 hours a day, every day of the year. By following simple operating procedures, your KETCH-ALL will provide years of proven, practical performance.