~Use FELIWAY CLASSIC Refill every month to continue to create a loving and comfortable home where you and your cat will always be ‘Happy Together’. Nurtures your relationship with your cat, by creating a loving environment at home. Continuous effect, provides constant comfort for your cat. Clinically proven, veterinary used and recommended FELIWAY CLASSIC Refill requires a FELIWAY CLASSIC Diffuser Refill lasts up to 30 days (48 mL) Each diffuser refill covers an area up to 70 m2 (750 ft2) Avoid plugging in the diffuser under shelves, behind doors, behind curtains, behind furniture, as it will not work FELIWAY CLASSIC Diffusers and Refills are sold separately. Use the peel-off sticker on each FELIWAY Classic Refill bottle to remind you when to check and replace the bottle The diffuser should be checked monthly and replaced every 6 months to ensure optimum effect