Calming diffuser · FELIWAY

FELIWAY Optimum Diffuser Starter Kit D92110K

FELIWAY's most advanced diffuser

Updated October 2026

Quick verdict

The strongest FELIWAY.

Strength
Covers stress and tension.
Trade-off
Pricier.
Right buyer
Stubborn stress signs.
Capacity
48 ml
Power source
Corded Electric
Product weight
9.6 ounces
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Why it matters

Optimum is FELIWAY's most advanced formula, combining help for general stress signs and tension between cats in one plug-in. The kit includes a 30-day refill.

Try it when Classic or MultiCat haven't been enough.

Who it's for, and who should skip it

Good fit if

  • Stubborn stress
  • Multi-cat homes
  • Moves

Look elsewhere if

  • Sudden behavior changes without a vet check
  • Owners expecting instant results
  • Rooms where the plug is hidden

Pros and cons

Pros

  • Advanced formula
  • Two uses
  • Starter kit

Cons

  • Pricier
  • Refills
  • Takes weeks

Limitations to weigh

  • Plug diffusers into the room your cat uses most.
  • Give it a few weeks; replace refills on schedule.
  • See a vet for sudden behavior changes.

Specifications

Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.

ScentUnscentedRetailer
Uses (seller)HomeRetailer
MaterialPlasticRetailer
Model nameFeliway OptimumRetailer
Model numberD92110KRetailer
Pieces2Retailer
Product weight9.6 ouncesRetailer
In the pack3.24 Fluid OuncesRetailer
In the boxDiffuser Kit (One diffuser, one vial)Retailer
Features (seller)Long Lasting AromaRetailer
Power sourceCorded ElectricRetailer
Capacity48 mlRetailer

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Final verdict

FELIWAY's all-in-one calming formula.

Where to buy

Our links open this exact model's product page. Prices and stock change; check what's included before you order.

Prices change often; the button shows today's price.

Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure

Questions buyers ask

What does it cover?
General stress signs and tension between cats.
How long does a refill last?
About 30 days.