Feliway friends 1 month refill for diffuser by Ceva-Sac is a refill solution for the diffuser that allows you to continue providing harmony at home, and avoid tensions between cats that live together. Help your cats get along better at home. Continuous effect, provides constant harmony. Each diffuser covers an area up to 70 m2. Continuous effect, provides constant harmony. It is recommended to screw the container into the diffuser and connect it to a socket. Keep the diffuser plugged in at all times. Avoid plugging the diffuser under bookshelves, behind doors, curtains, or furniture because it will not work properly. Store in a cool, dry place, away from heat and moisture.