We recommend using an additional diffuser if the room is bigger than 700 square feet. We recommend plugging in the FELIWAY Optimum diffuser in the room where you cat spends the most time, or where conflict among your cats happen most frequently. Try not to plug the diffuser under items (e.g. shelves) or close to objects (e.g. behind curtain or doors) as this affects efficacy. We do not recommend plugging your diffuser in near your litterbox or in a hallway - while your cat may frequent these places, they likely do not spend as much time in these places as you'd think. If your litterbox is in the room where your cat spends the most time, you will want to plug your diffuser into that room.

Use FELIWAY Optimum each month to create a constant calming environment. Check the diffuser and refills monthly; you'll want to replace the refill each month, and replace the diffuser head twice a year (every six months) to guarantee the best effect. Make sure to only use a FELIWAY Optimum diffuser with a FELIWAY Optimum Refill. The diffuser is not compatible with refills from other brands, and the FELIWAY Optimum vial should not be used with other diffusers. Never use a diffuser or refill of another brand with a FELIWAY product. Each FELIWAY Diffuser comes with a plug adapted to the local electric systems. Please do not use this diffuser in another country that has a different voltage or with an adapter: it may conduct serious security concerns. Make sure that your diffuser has the fitting plug for your country before plugging in.

FELIWAY Optimum is a new pheromone discovery, and the best FELIWAY answer to help reduce common signs of stress in cats such as:

scratching, urine spraying, tension and conflicts between cats, fears, and reactions to changes
93% of cat owners report enhanced calming, with an average satisfaction rating of 9.1 out of 10

FELIWAY Optimum is a drug free solution that helps cats with more signs of stress, in more situations, and calms cats better than ever;

FELIWAY is supported by 25+ years of feline stress expertise

FELIWAY Optimum heated diffuser covers up to 700 square feet; make sure to plug your diffuser in with the vents up, and for the best results, position the diffuser where your cat spends most of his or her time - avoid plugging the diffuser in under shelves and behind doors, curtains, or furniture

Starter kit includes 1 diffuser head and 1 vial; make sure to only use a FELIWAY Optimum Diffuser with a FELIWAY Optimum refill (they are not compatible with other brands); to maximize effectiveness, replace the vial once a month, and the diffuser every 6 months