Johnsons 4 Fleas Room Fogger 100ml Johsons 4 Fleas Room Fogger is a misting device designed to kill fleas & other crawling insects (such as ants, cockroaches, earwigs etc.) in one complete treatment. Prevents hatching eggs developing into fleas & protects carpets, soft furnishings & pet bedding for up to 7 months. It couldn't be easier to use! Simply place in your chosen room, press & leave. This 100ml canister treats an area of 35m 2. Contains permethrin & s-methoprene (with IGR).WARNING: Always read the instructions provided. Keep people & pets out of the room being treated.