On Sale Now! ✨Feliway Optimum *Top-of-the-Line Model* Value Set✨ 3 Liquid Refills (New) + 2 Diffusers (Used for a Short Time) One diffuser used once. The one with the sticky note was used twice. This is the "Optimum" model, the top-of-the-line version of Feliway, offering even broader stress support than the Classic model. While Classic primarily supports "calmness" and "relaxation," Optimum uses enhanced pheromones to address "improving relationships between cats" and "multiple stress factors." It's effective for: • Multiple cat households • Environmental changes (moving, guests, redecorating) • Litter box issues • Nervous personalities • Signs of anxiety and more, making it suitable for a wider range of situations. I'm selling this set because I've switched to a different care method. • 3 liquid refills are completely unused. • 2 diffusers were used only once/twice (operation confirmed). • Carefully cleaned to prevent pet scent transfer. Even just the liquid refills have increased in price, with new ones costing over 5,000 yen each, so this is a great deal for those considering buying in bulk. I purchased 6 refills on August 27, 2025, and used 3.