Adams Plus Breakaway Flea & Tick Collar for Cats & KittensThe Adams Plus Flea and Tick Collar begins killing fleas, ticks, and flea eggs and larvae on cats immediately. Insect Growth Regulator keeps killing eggs for up to 7 months, preventing reinfestation. It continues to work when wet and may be worn with a regular collar. Kills and repels fleas, ticks, eggs and larvae IGR kills flea eggs for up to 7 months of protection Keeps working, even when wet The collars full protection against harder to kill ticks